Table Of Contents

Trunk Configuration

Finding a Trunk

Configuring a Trunk

Trunk Configuration Settings

Deleting a Trunk

Resetting a Trunk

Related Topics

Trunk Configuration

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Use a trunk device to configure a logical route to a gatekeeper (that is, the wholesale network or an intercluster trunk with gatekeeper control), to an intercluster trunk without a gatekeeper, or to a SIP network. Choose from the following available trunk types:

•H.225 trunk (gatekeeper controlled)

•Intercluster trunk (gatekeeper controlled)

•Intercluster trunk (non-gatekeeper controlled)

•SIP trunk

The following topics cover Cisco Unified Communications Manager trunk configuration:

•Finding a Trunk

•Configuring a Trunk

•Trunk Configuration Settings

•Deleting a Trunk

•Resetting a Trunk

The following topics contain additional information that is related to trunks:

•Call Admission Control, Cisco Unified Communications Manager System Guide

•Gatekeepers and Trunks, Cisco Unified Communications Manager System Guide

•Gatekeeper and Trunk Configuration in Cisco Unified Communications Manager, Cisco Unified Communications Manager System Guide

•Understanding Session Initiation Protocol (SIP), Cisco Unified Communications Manager System Guide

•Cisco Unified Communications Solution Reference Network Design (SRND)

Finding a Trunk

Because you might have multiple trunks in your network, Cisco Unified Communications Manager lets you search for trunks on the basis of specified criteria. Follow these steps to search for a specific trunk in the Cisco Unified Communications Manager database.

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Note During your work in a browser session, Cisco Unified Communications Manager Administration retains your trunk search preferences. If you navigate to other menu items and return to this menu item, Cisco Unified Communications Manager Administration retains your trunk search preferences until you modify your search or close the browser.

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Procedure

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Step 1 Choose Device > Trunk.

The Find and List Trunks window displays. Records from an active (prior) query may also display in the window.

Step 2 To find all records in the database, ensure the dialog box is empty; go to Step 3.

To filter or search records

•From the first drop-down list box, select a search parameter.

•From the second drop-down list box, select a search pattern.

•Specify the appropriate search text, if applicable.

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Note To add additional search criteria, click the + button. When you add criteria, the system searches for a record that matches all criteria that you specify. To remove criteria, click the - button to remove the last added criterion or click the Clear Filter button to remove all added search criteria.

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Step 3 Click Find.

All matching records display. You can change the number of items that display on each page by choosing a different value from the Rows per Page drop-down list box.

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Note You can delete multiple records from the database by checking the check boxes next to the appropriate record and clicking Delete Selected. You can delete all configurable records for this selection by clicking Select All and then clicking Delete Selected.

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Step 4 From the list of records that display, click the link for the record that you want to view.

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Note To reverse the sort order, click the up or down arrow, if available, in the list header.

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The window displays the item that you choose.

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Additional Topics

See the "Related Topics" section.

Configuring a Trunk

Perform the following procedure to add a new trunk device or update an existing trunk device.

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Note You can configure multiple trunk devices per Cisco Unified Communications Manager cluster.

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Before You Begin

Configure SIP Trunk Security Profiles and SIP Profiles before you configure a SIP Trunk. For more information, see the "Configuring SIP Profiles" section on page 92-2, SIP Trunk Security Profile Configuration, and the Cisco Unified Communications Manager Security Guide.

Procedure

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Step 1 Choose Device > Trunk.

The Find and List Trunks window displays.

Step 2 Perform one of the followings tasks:

•To add a new trunk device, click the Add New button. The Trunk Configuration window displays. Continue with Step 3.

•To update trunk settings, locate the appropriate trunk as described in "Finding a Trunk" section. Click the name of the trunk that you want to update. Continue with Step 6.

Step 3 From the Trunk Type drop-down list, choose the type of trunk.

Step 4 If applicable, from the Device Protocol drop-down list, choose the device protocol.

Step 5 Click Next.

Step 6 On the Trunk Configuration window that displays, enter the appropriate settings for gatekeeper-controlled H.225 trunks, gatekeeper-controlled intercluster trunks, and non-gatekeeper-controlled intercluster trunks as described in Table 83-1. For SIP trunks, enter the appropriate settings as described in Table 83-2.

Step 7 To add the new trunk, click Save.

The trunk gets added to the database.

If you are updating an existing trunk, click Reset Trunk to reset or restart the trunk and apply the new settings.

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Note Resetting a trunk drops any calls in progress that are using that trunk. Restarting a gateway tries to preserve the calls in progress that are using that gateway, if possible. Other devices wait until calls complete before restarting or resetting. Resetting/restarting an H.323 or SIP device does not physically reset/restart the hardware; it only reinitializes the configuration that is loaded by Cisco Unified Communications Manager

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Additional Topics

See the "Related Topics" section.

Trunk Configuration Settings

Table 83-1 describes the trunk configuration settings for gatekeeper-controlled H.225 trunks, gatekeeper-controlled intercluster trunks, and non-gatekeeper-controlled intercluster trunks.

Table 83-2 describes the trunk configuration settings for SIP trunks.

For more information about related procedures, see the "Related Topics" section.

Table 83-1 Trunk Configuration Settings for H.225 and Intercluster Trunks 

Field	Description
Device Information
Device Name	Enter a unique identifier for the trunk.
Description	Enter a descriptive name for the trunk.
Device Pool	Choose the appropriate device pool for the trunk. For trunks, device pools specify a list of Cisco Unified Communications Managers that the trunk uses to distribute the call load dynamically. Note Calls that are initiated from a phone that is registered to a Cisco Unified Communications Manager that does not belong to the device pool of the trunk use different Cisco Unified Communications Managers of this device pool for different outgoing calls. Selection of nodes occurs in a random order. A call that is initiated from a phone that is registered to a Cisco Unified Communications Manager that does belong to the device pool of the trunk uses the same Cisco Unified Communications Manager node for outgoing calls if the Cisco Unified Communications Manager is up and running.
Common Device Configuration	Choose the common device configuration to which you want this trunk assigned. The common device configuration includes the attributes (services or features) that are associated with a particular user. Common device configurations are configured in the Common Device Configuration window.
Call Classification	This parameter determines whether an incoming call through this trunk is considered off the network (OffNet) or on the network (OnNet). When the Call Classification field is configured as Use System Default, the setting of the Cisco Unified Communications Manager clusterwide service parameter, Call Classification, determines whether the trunk is OnNet or OffNet. This field provides an OnNet or OffNet alerting tone when the call is OnNet or OffNet, respectively. The alerting tones are provided by Cisco Unified Communications Manager Annunciators. Use this parameter in conjunction with the settings on the Route Pattern Configuration window to classify an outgoing call as OnNet or OffNet.
Media Resource Group List	This list provides a prioritized grouping of media resource groups. An application chooses the required media resource, such as a Music On Hold server, from among the available media resources according to the priority order that a Media Resource Group List defines.
Location	Choose the appropriate location for the trunk. The location specifies the total bandwidth that is available for calls between this location and the central location, or hub. A location setting of Hub_None specifies unlimited available bandwidth.
AAR Group	Choose the automated alternate routing (AAR) group for this device. The AAR group provides the prefix digits that are used to route calls that are otherwise blocked due to insufficient bandwidth. An AAR group setting of None specifies that no rerouting of blocked calls will be attempted.
Tunneled Protocol	This drop-down list box displays for H.225 trunks, gatekeeper-controlled trunks, and non-gatekeeper-controlled trunks. Choose the QSIG option if you want to use trunks to transport (tunnel) non-H.323 protocol information in H.323 signaling messages from Cisco Unified Communications Manager to other Annex M.1-compliant H.323 PINXs. QSIG tunneling supports the following features: Call Completion, Call Diversion, Call Transfer, Identification Services, and Message Waiting Indication.
Packet Capture Mode	This setting exists for troubleshooting encryption only; packet capturing may cause high CPU usage or call-processing interruptions. Choose one of the following options from the drop-down list box: •None—This option, which serves as the default setting, indicates that no packet capturing is occurring. After you complete packet capturing, configure this setting. •Batch Processing Mode—Cisco Unified Communications Manager writes the decrypted or nonencrypted messages to a file, and the system encrypts each file. On a daily basis, the system creates a new file with a new encryption key. Cisco Unified Communications Manager, which stores the file for seven days, also stores the keys that encrypt the file in a secure location. Cisco Unified Communications Manager stores the file in the PktCap virtual directory. A single file contains the time stamp, source IP address, source IP port, destination IP address, packet protocol, message length, and the message. The IREC tool uses HTTPS, administrator username and password, and the specified day to request a single encrypted file that contains the captured packets. Likewise, the tool requests the key information to decrypt the encrypted file. Tip You do not have to reset the trunk after enabling/disabling Packet Capturing. For more information on capturing packets, refer to the Troubleshooting Guide for Cisco Unified Communications Manager.
Packet Capture Duration	This setting exists for troubleshooting encryption only; packet capturing may cause high CPU usage or call-processing interruptions. This field specifies the maximum number of minutes that is allotted for one session of packet capturing. The default setting equals 0, although the range exists from 0 to 300 minutes. To initiate packet capturing, enter a value other than 0 in the field. After packet capturing completes, the value, 0, displays. For more information on capturing packets, refer to the Cisco Unified Communications Manager Troubleshooting Guide.
Media Termination Point Required	This check box is used to indicate whether a media termination point (MTP) is used to implement features that H.323 does not support (such as hold and transfer). Check the Media Termination Point Required check box if you want to use a media termination point to implement features. Uncheck the Media Termination Point Required check box if you do not want to use a media termination point to implement features. Use this check box only for H.323 clients and those H.323 devices that do not support the H.245 Empty Capabilities Set or if you want media streaming to terminate through a single source. If you check this check box to require an MTP and one or both parties are a video endpoint, the call operates as audio only.
Retry Video Call as Audio	This check box applies only to video endpoints that receive a call. For trunks, this check box pertains to calls that are received from Cisco Unified Communications Manager but not to calls that are received from the wide-area network (WAN). By default, the system checks this check box to specify that this device should immediately retry a video call as an audio call (if it cannot connect as a video call) prior to sending the call to call control for rerouting. If you uncheck this check box, a video call that fails to connect as video does not try to establish as an audio call. The call then fails to call control, and call control routes the call via Automatic Alternate Routing (AAR) and/or route/hunt list.
Wait for Far-End H.245 Terminal Capability Set	This field applies only to H.323 devices. This check box specifies that Cisco Unified Communications Manager waits to receive the far-end H.245 Terminal Capability Set before it sends its H.245 Terminal Capability Set. By default, the system checks this check box. To specify that Cisco Unified Communications Manager should initiate capabilities exchange, uncheck this check box.
Path Replacement Support	If you choose the QSIG option from the Tunneled Protocol drop-down list box, this check box displays for H.225 trunks, gatekeeper-controlled trunks, and non-gatekeeper-controlled trunks. This setting works with QSIG tunneling (Annex M.1) to ensure that non-H.323 information gets sent on the leg of the call that uses path replacement. Note The default setting leaves the check box unchecked. When you choose the QSIG Tunneled Protocol option, the system automatically checks the check box.
Transmit UTF-8 for Calling Party Name	This device uses the user locale setting of the SIP trunks to determine whether to send Unicode and whether to translate received Unicode information. For the sending device, if you check this check box and the user locale setting in the device pool at the device matches the terminating phone user locale, the device sends Unicode. If the user locale settings do not match, the device sends ASCII. The receiving device translates incoming Unicode characters based on the user locale setting of the sending device pool of the device. If the user locale setting matches the terminating phone's user locale, the phone displays the characters. Note The phone may display garbled characters if the two ends of the trunk configure user locales that do not belong to the same language group.
Unattended Port	Check this check box if calls can be redirected, transferred and forwarded to an unattended port, such as a voice mail port. The default value for this check box leaves it unchecked.
SRTP Allowed	Check the SRTP Allowed check box if you want Cisco Unified Communications Manager to allow secure and nonsecure calls over the trunk. If you do not check this check box, Cisco Unified Communications Manager prevents SRTP negotiation with the trunk and uses RTP. Caution If you check this check box, Cisco strongly recommends that you configure IPSec, so you do not expose keys and other security-related information during call negotiations. If you do not configure IPSec correctly, consider signaling between Cisco Unified Communications Manager and the gateway as nonsecure. For more information on encryption for trunks, refer to the Cisco Unified Communications Manager Security Guide.
Multilevel Precedence and Preemption (MLPP) Information
MLPP Domain	From the drop-down list box, choose an MLPP domain to associate with this device. If you leave this field blank, this device inherits its MLPP domain from the value that was set for the device pool. If the device pool does not have an MLPP Domain setting, this device inherits its MLPP Domain from the value that was set for the MLPP Domain Identifier enterprise parameter.
MLPP Indication	If available, this setting specifies whether a device that is capable of playing precedence tones will use the capability when it places an MLPP precedence call. From the drop-down list box, choose a setting to assign to this device from the following options: •Default—This device inherits its MLPP indication setting from its device pool. •Off—This device does not handle nor process indication of an MLPP precedence call. •On—This device does handle and process indication of an MLPP precedence call. Note Do not configure a device with the following combination of settings: MLPP Indication is set to Off or Default (when default is Off) while MLPP Preemption is set to Forceful.
Call Routing Information
Inbound Calls
Significant Digits	Significant digits represent the number of final digits that are retained on inbound calls. Use for the processing of incoming calls and to indicate the number of digits that are used to route calls that are coming in to the H.323 device. Choose the number of significant digits to collect, from 0 to 32. Cisco Unified Communications Manager counts significant digits from the right (last digit) of the number that is called.
Calling Search Space	From the drop-down list box, select the appropriate calling search space for the trunk. The calling search space specifies the collection of route partitions that are searched to determine how to route a collected (originating) number. You can configure the number of items that display in this drop-down list box by using the Max List Box Items enterprise parameter. If more calling search spaces exist than the Max List Box Items enterprise parameter specifies, the Find button displays next to the drop-down list box. Click the Find button to display the Find and List Calling Search Spaces window. Find and choose a calling search space name by using the Finding a Calling Search Space procedure in the Cisco Unified Communications Manager Administration Guide. Note To set the maximum list box items, choose System > Enterprise Parameters and choose CCMAdmin Parameters.
AAR Calling Search Space	Choose the appropriate calling search space for the device to use when performing automated alternate routing (AAR). The AAR calling search space specifies the collection of route partitions that are searched to determine how to route a collected (originating) number that is otherwise blocked due to insufficient bandwidth.
Prefix DN	Enter the prefix digits that are appended to the called party number on incoming calls. Cisco Unified Communications Manager adds prefix digits after first truncating the number in accordance with the Significant Digits setting.
Redirecting Number IE Delivery - Inbound	Check this check box to accept the Redirecting Number IE in the incoming SETUP message to the Cisco Unified Communications Manager. (The UUIE part of the SETUP message includes the Redirecting Number IE.) Uncheck the check box to exclude the Redirecting Number IE. You use Redirecting Number IE for voice-messaging integration only. If your configured voice-messaging system supports Redirecting Number IE, you should check the check box. Note Default leaves the check box checked. You cannot check this check box if you choose the QSIG option from the Tunneled Protocol drop-down list box.
Enable Inbound FastStart	Check this check box to enable the H.323 FastStart call connections on incoming calls. By default, the check box remains unchecked for the H.323 gateway. For intercluster calls, you must check the Enable Inbound FastStart check box on Cisco Unified Communications Manager servers in other clusters for the outbound FastStart feature to work.
Outbound Calls
Calling Party Selection	Choose the directory number that is sent on an outbound call on a gateway. The following options specify which directory number is sent: •Originator—Send the directory number of the calling device. •First Redirect Number—Send the directory number of the redirecting device. •Last Redirect Number—Send the directory number of the last device to redirect the call. •First Redirect Number (External)—Send the external directory number of the redirecting device. •Last Redirect Number (External)—Send the external directory number of the last device to redirect the call.
Calling Line ID Presentation	Cisco Unified Communications Manager uses calling line ID presentation (CLIP) as a supplementary service to control the display of the calling party number on the called party phone display screen. Choose Default if you do not want to change the presentation setting. Choose Allowed if you want calling number information to display. Choose Restricted if you do not want the calling number information to display.
Called Party IE Number Type Unknown	Choose the format for the type of number in called party directory numbers. Cisco Unified Communications Manager sets the called directory number (DN) type. Cisco recommends that you do not change the default value unless you have advanced experience with dialing plans, such as NANP or the European dialing plan. You may need to change the default in Europe because Cisco Unified Communications Manager does not recognize European national dialing patterns. You can also change this setting when you are connecting to a PBX that expects the called directory number to be encoded to a non-national numbering plan type. Choose one of the following options: •Cisco Unified Communications Manager—Cisco Unified Communications Manager sets the directory number type. •Unknown—This option indicates that the dialing plan is unknown. •National—Use when you are dialing within the dialing plan for your country. •International—Use when you are dialing outside the dialing plan for your country. •Subscriber—Use when you are dialing a subscriber by using a shortened subscriber number.
Calling Party IE Number Type Unknown	Choose the format for the type of number in calling party directory numbers. Cisco Unified Communications Manager sets the calling directory number (DN) type. Cisco recommends that you do not change the default value unless you have advanced experience with dialing plans, such as NANP or the European dialing plan. You may need to change the default in Europe because Cisco Unified Communications Manager does not recognize European national dialing patterns. You can also change this setting when you are connecting to a PBX that expects the calling directory number to be encoded to a non-national numbering plan type. Choose one of the following options: •Cisco Unified Communications Manager—Cisco Unified Communications Manager sets the directory number type. •Unknown—This option indicates that the dialing plan is unknown. •National—Use when you are dialing within the dialing plan for your country. •International—Use when you are dialing outside the dialing plan for your country. •Subscriber—Use when you are dialing a subscriber by using a shortened subscriber number.
Called Numbering Plan	Choose the format for the numbering plan in called party directory numbers. Cisco Unified Communications Manager sets the called DN numbering plan. Cisco recommends that you do not change the default value unless you have advanced experience with dialing plans, such as NANP or the European dialing plan. You may need to change the default in Europe because Cisco Unified Communications Manager does not recognize European national dialing patterns. You can also change this setting when you are connecting to a PBX that expects the called numbering plan to be encoded to a non-national numbering plan. Choose one of the following options: •Cisco Unified Communications Manager—Cisco Unified Communications Manager sets the Numbering Plan in the directory number. •ISDN—Use when you are dialing outside the dialing plan for your country. •National Standard—Use when you are dialing within the dialing plan for your country. •Private—Use when you are dialing within a private network. •Unknown—This option indicates that the dialing plan is unknown.
Calling Numbering Plan	Choose the format for the numbering plan in calling party directory numbers. Cisco Unified Communications Manager sets the calling DN numbering plan. Cisco recommends that you do not change the default value unless you have advanced experience with dialing plans, such as NANP or the European dialing plan. You may need to change the default in Europe because Cisco Unified Communications Manager does not recognize European national dialing patterns. You can also change this setting when you are connecting to a PBX that expects the calling numbering plan to be encoded to a non-national numbering plan. Choose one of the following options: •Cisco Unified Communications Manager—Cisco Unified Communications Manager sets the Numbering Plan in the directory number. •ISDN—Use when you are dialing outside the dialing plan for your country. •National Standard—Use when you are dialing within the dialing plan for your country. •Private—Use when you are dialing within a private network. •Unknown—This option indicates that the dialing plan is unknown.
Caller ID DN	Enter the pattern, from 0 to 24 digits, that you want to use to format the caller ID on outbound calls from the trunk. For example, in North America •555XXXX = Variable Caller ID, where X represents an extension number. The Central Office (CO) appends the number with the area code if you do not specify it. •5555000 = Fixed Caller ID. Use this form when you want the Corporate number to be sent instead of the exact extension from which the call is placed. The CO appends the number with the area code if you do not specify it.
Display IE Delivery	Check this check box to enable delivery of the display information element (IE) in SETUP and CONNECT messages for the calling and called party name delivery service. Note The default setting leaves this check box checked. You cannot check this check box if you choose the QSIG option from the Tunneled Protocol drop-down list box.
Redirecting Number IE Delivery - Outbound	Check this check box to indicate the first redirecting number and the redirecting reason of the call when the call is forwarded. (The UUIE part of the outgoing SETUP message from the Cisco Unified Communications Manager includes the Redirecting Number IE.) Uncheck the check box to exclude the first Redirecting Number and the redirecting reason. You use Redirecting Number IE for voice-messaging integration only. If your configured voice-messaging system supports Redirecting Number IE, you should check the check box. Note The default setting leaves this check box checked. You cannot check this check box if you choose the QSIG option from the Tunneled Protocol drop-down list box.
Enable Outbound FastStart	Check this check box to enable the H.323 FastStart feature on outgoing calls. By default, the check box remains unchecked for the H.323 gateway or trunk. When you check the Enable Outbound FastStart check box, you must set the Media Termination Point Required, Media Resource Group Lists, and Codec for Outbound FastStart.
Codec For Outbound FastStart	Choose the codec for use with the H.323 device for an outbound FastStart call: •G711 mu-law 64K (default) •G711 a-law 64K •G723 •G729 •G729AnnexA •G729AnnexB •G729AnnexA-AnnexB When you check the Enable Outbound FastStart check box, you must choose the codec for supporting outbound FastStart calls.
Gatekeeper Information (for gatekeeper-controlled H.225 trunks and intercluster trunks)
Gatekeeper Name	Choose the gatekeeper that controls this trunk. Note For a gatekeeper-controlled trunk to register correctly with a gatekeeper through use of H.323 dynamic addressing, you must set the Send Product ID and Version ID service parameter to True. (The default value specifies False.) To do so, choose System > Service Parameters and find the Send Product ID and Version ID service parameter for the Cisco CallManager service in the Clusterwide Parameters (Device - H323) portion of the Service Parameter Configuration window.
Terminal Type	Use the Terminal Type field to designate the type for all devices that this trunk controls. Always set this field to Gateway for normal trunk call admission control.
Technology Prefix	Use this optional field to eliminate the need for entering the IP address of every Cisco Unified Communications Manager when configuring the gw-type-prefix on the gatekeeper: •If you leave this field blank (the default setting), you must specify the IP address of each Cisco Unified Communications Manager that can register with the gatekeeper when you enter the gw-type-prefix command on the gatekeeper. •When you use this field, make sure that the value that you enter exactly matches the type-prefix value that is specified with the gw-type-prefix command on the gatekeeper. For example, if you leave this field blank and you have two Cisco Unified Communications Managers with IP addresses of 10.1.1.2 and 11.1.1.3, enter the following gw-type-prefix command on the gatekeeper: gw-type-prefix 1#* default-technology gw ip 10.1.1.2 gw ip 11.1.1.3 If you enter 1#* in this field, enter the following gw-type-prefix command on the gatekeeper: gw-type-prefix 1#* default-technology
Zone	Use this optional field to request a specific zone on the gatekeeper with which Cisco Unified Communications Manager will register. The zone specifies the total bandwidth that is available for calls between this zone and another zone: •If you do not enter a value in this field, the zone subnet command on the gatekeeper determines the zone with which Cisco Unified Communications Manager registers. Cisco recommends the default setting for most configurations. •If you want Cisco Unified Communications Manager to register with a specific zone on the gatekeeper, enter the value in this field that exactly matches the zone name that is configured on the gatekeeper with the zone command. Specifying a zone name in this field eliminates the need for a zone subnet command for each Cisco Unified Communications Manager that is registered with the gatekeeper. Refer to the command reference documentation for your gatekeeper for more information.
Remote Cisco Unified Communications Manager Information (for non-gatekeeper-controlled intercluster trunks)
Server 1 IP Address/Host Name	Enter the IP address or host name of the first remote Cisco Unified Communications Manager that this trunk accesses.
Server 2 IP Address/Host Name	Enter the IP address or host name of the second remote Cisco Unified Communications Manager that this trunk accesses. Note If this non-gatekeeper-controlled intercluster trunk accesses the device pool of a remote non-gatekeeper-controlled intercluster trunk and that device pool has a second Cisco Unified Communications Manager node, you must enter the second remote Cisco Unified Communications Manager IP address/host name in this field.
Server 3 IP Address/Host Name	Enter the IP address or host name of the third remote Cisco Unified Communications Manager that this trunk accesses. Note If this non-gatekeeper-controlled intercluster trunk accesses the device pool of a remote non-gatekeeper-controlled intercluster trunk and that device pool has a third Cisco Unified Communications Manager node, you must enter the third remote Cisco Unified Communications Manager IP address/host name in this field.
UUIE Configuration
Passing Precedence Level Through UUIE	Check this check box to enable passing MLPP information through the PRI 4ESS UUIE field. The system uses this box for interworking with DRSN switch. The system makes this check box available only if the PRI Protocol Type value of PRI 4ESS is specified for this trunk. The default value specifies unchecked.
Security Access Level	Enter the value for the security access level. Valid values include 00 through 99. The system makes this field available only if the Passing Precedence Level Through UUIE check box is checked. The default value specifies 2.

Table 83-2 describes the trunk configuration settings for SIP trunks.

Table 83-2 Trunk Configuration Settings for SIP Trunks 

Field	Description
Device Information
Device Name	Enter a unique identifier for the trunk.
Description	Enter a descriptive name for the trunk.
Device Pool	Choose the appropriate device pool for the trunk. For trunks, device pools specify a list of Cisco Unified Communications Managers that the trunk uses to distribute the call load dynamically. Note Calls that are initiated from a phone that is registered to a Cisco Unified Communications Manager that does not belong to the device pool of the trunk use different Cisco Unified Communications Managers of this device pool for different outgoing calls. Selection of Cisco Unified Communications Manager nodes occurs in a random order. A call that is initiated from a phone that is registered to a Cisco Unified Communications Manager that does belong to the device pool of the trunk uses the same Cisco Unified Communications Manager node for outgoing calls if the Cisco Unified Communications Manager is up and running. The default value for Device Pool specifies Not Selected.
Common Device Configuration	Choose the common device configuration to which you want this trunk assigned. The common device configuration includes the attributes (services or features) that are associated with a particular user. Common device configurations are configured in the Common Device Configuration window.
Call Classification	This parameter determines whether an incoming call through this trunk is considered off the network (OffNet) or on the network (OnNet). The default value for Call Classification is Use System Default. When the Call Classification field is configured as Use System Default, the setting of the Cisco Unified Communications Manager clusterwide service parameter, Call Classification, determines whether the trunk is OnNet or OffNet. This field provides an OnNet or OffNet alerting tone when the call is OnNet or OffNet, respectively. Use this parameter in conjunction with the settings on the Route Pattern Configuration window to classify an outgoing call as OnNet or OffNet.
Media Resource Group List	This list provides a prioritized grouping of media resource groups. An application chooses the required media resource, such as a Music On Hold server, from among the available media resources according to the priority order that a Media Resource Group List defines. The default value for Media Resource Group List specifies None.
Location	Choose the appropriate location for the trunk. The location specifies the total bandwidth that is available for calls between this location and the central location, or hub. A location setting of Hub_None specifies unlimited available bandwidth. The location also associates with the RSVP policy with regard to other locations. The configuration allows RSVP to be enabled and disabled based upon location pairs. The default value for Location specifies Hub_None.
AAR Group	Choose the automated alternate routing (AAR) group for this device. The AAR group provides the prefix digits that are used to route calls that are otherwise blocked due to insufficient bandwidth. An AAR group setting of None specifies that no rerouting of blocked calls will be attempted. The default value for AAR Group specifies None.
Packet Capture Mode	This setting exists for troubleshooting encryption only; packet capturing may cause high CPU usage or call-processing interruptions. Choose one of the following options from the drop-down list box: •None—This option, which serves as the default setting, indicates that no packet capturing is occurring. After you complete packet capturing, configure this setting. •Batch Processing Mode—Cisco Unified Communications Manager writes the decrypted or nonencrypted messages to a file, and the system encrypts each file. On a daily basis, the system creates a new file with a new encryption key. Cisco Unified Communications Manager, which stores the file for seven days, also stores the keys that encrypt the file in a secure location. Cisco Unified Communications Manager stores the file in the PktCap virtual directory. A single file contains the time stamp, source IP address, source IP port, destination IP address, packet protocol, message length, and the message. The TAC debugging tool uses HTTPS, administrator username and password, and the specified day to request a single encrypted file that contains the captured packets. Likewise, the tool requests the key information to decrypt the encrypted file. Before you contact TAC, you must capture the SRTP packets by using a sniffer trace between the affected devices. For more information on capturing packets, refer to the Troubleshooting Guide for Cisco Unified Communications Manager.
Packet Capture Duration	This setting exists for troubleshooting encryption only; packet capturing may cause high CPU usage or call-processing interruptions. This field specifies the maximum number of minutes that is allotted for one session of packet capturing. The default setting equals 0, although the range exists from 0 to 300 minutes. To initiate packet capturing, enter a value other than 0 in the field. After packet capturing completes, the value, 0, displays. For more information on capturing packets, refer to the Cisco Unified Communications Manager Troubleshooting Guide.
Media Termination Point Required	You can configure Cisco Unified Communications Manager SIP trunks to always use an MTP. Check this check box to provide media channel information in the outgoing INVITE request. When this check box is checked, all media channels must terminate and reoriginate on the MTP device. If you uncheck the check box, the Cisco Unified Communications Manager can decide whether calls are to go through the MTP device or be connected directly between the endpoints. Note If check box remains unchecked (default case), Cisco Unified Communications Manager will attempt to dynamically allocate an MTP if the DTMF methods for the call legs are not compatible. For example, existing SCCP phones support only out-of-band DTMF, and existing SIP phones support RFC2833. Because the DTMF methods are not identical, the Cisco Unified Communications Manager will dynamically allocate an MTP. If, however, a new SCCP phone, which supports RFC2833 and out-of-band, calls an existing SIP phone, Cisco Unified Communications Manager will not allocate an MTP because both phones support RFC2833. So, by having the same type of DTMF method supported on each phone, no need exists for MTP.
Retry Video Call as Audio	This check box pertains to outgoing SIP trunk calls and does not impact incoming calls. By default, the system checks this check box to specify that this device should immediately retry a video call as an audio call (if it cannot connect as a video call) prior to sending the call to call control for rerouting. If you uncheck this check box, a video call that fails to connect as video does not try to establish as an audio call. The call then fails to call control, and call control routes the call via Automatic Alternate Routing (AAR) and/or route/hunt list.
Transmit UTF-8 for Calling Party Name	This device uses the user locale setting of the device pool to determine whether to send Unicode and whether to translate received Unicode information. For the sending device, if you check this check box and the user locale setting in the device pool matches the terminating phone user locale, the device sends Unicode. If the user locale settings do not match, the device sends ASCII. The receiving device translates incoming Unicode characters based on the user locale setting of the sending device pool. If the user locale setting matches the terminating phone's user locale, the phone displays the characters. Note The phone may display malformed characters if the two ends of the trunk configure user locales that do not belong to the same language group. The default value for Transmit UTF-8 for Calling Party Name leaves the check box unchecked.
Unattended Port	Check this check box if calls can be redirected and transferred to an unattended port, such as a voice mail port. The default value for this check box leaves it unchecked.
Multilevel Precedence and Preemption (MLPP) Information
MLPP Domain	From the drop-down list, choose an MLPP domain to associate with this device. If you leave this field blank, this device inherits its MLPP domain from the value that is set for the device pool. If the device pool does not have an MLPP Domain setting, this device inherits its MLPP Domain from the value that is set for the MLPP Domain Identifier enterprise parameter. The default value for MLPP Domain specifies None.
Call Routing Information
Inbound Calls
Significant Digits	Significant digits represent the number of final digits that are retained on inbound calls. Use for the processing of incoming calls and to indicate the number of digits that are used to route calls that are coming in to the SIP device. Choose the number of significant digits to collect, from 0 to 32, or choose All. Note Cisco Unified Communications Manager counts significant digits from the right (last digit) of the number that is called. The default value for Significant Digits specifies All.
Connected Line ID Presentation	Cisco Unified Communications Manager uses connected line ID presentation (COLP) as a supplementary service to provide the calling party with the connected party number. The SIP trunk level configuration takes precedence over the call-by-call configuration. The default value for Connected Line ID Presentation specifies Default, which translates to Allowed.Choose Default if you want Cisco Unified Communications Manager to send connected line information. Choose Restricted if you do not want Cisco Unified Communications Manager to send connected line information.
Connected Name Presentation	Cisco Unified Communications Manager uses connected name ID presentation (CONP) as a supplementary service to provide the calling party with the connected party's name. The SIP trunk level configuration takes precedence over the call-by-call configuration. The default value for Connected Name Presentation specifies Default, which translates to Allowed. Choose Default if you want Cisco Unified Communications Manager to send connected name information. Choose Restricted if you do not want Cisco Unified Communications Manager to send connected name information.
Calling Search Space	From the drop-down list box, choose the appropriate calling search space for the trunk. The calling search space specifies the collection of route partitions that are searched to determine how to route a collected (originating) number. You can configure the number of items that display in this drop-down list box by using the Max List Box Items enterprise parameter. If more calling search spaces exist than the Max List Box Items enterprise parameter specifies, the Find button displays next to the drop-down list box. Click the Find button to display the Find and List Calling Search Spaces window. Find and choose a calling search space name by using the Finding a Calling Search Space procedure in the Cisco Unified Communications Manager Administration Guide. Note To set the maximum list box items, choose System > Enterprise Parameters and choose CCMAdmin Parameters. The default value for Calling Search Space specifies None.
AAR Calling Search Space	Choose the app