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Table Of Contents
ISDN Module
The following sections are provided:
Feature Summary
The ISDN module ensures that the ISDN protocol stack functions properly while the D-channel information (Q.931 and the Q.921 frames) are transported over possibly multiple IP networks via UDP across links managed by the Redundant Link Manager (RLM). For more information about RLM, see the feature module Redundant Link Manager (RLM).
Benefits
The Cisco SS7/C7 Dial Access Solution System runs on the Cisco AS5200, AS5300, and AS5800 Access Servers in conjunction with Cisco Signaling Controller (CSC) on the Network Access Servers (NAS) to enhance features previously introduced in Cisco IOS release 11.3(5)AA. These features include:
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Redundant Link Management (RLM)
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Provided is support for IP connection to SS7/C7 Singnaling Controller and associated continuity testing. This support allows carrier customers to connect their access servers to the Public Switch Telephone Network (PSTN) directly, by using Signaling System #7 (SS7/C7) signaling protocols. The SS7/C7 signaling links terminate on a separate UNIX system called the Signaling Controller (SC2200). The SC2200 maps incoming calls, which are signaled via SS7/C7, to bearers on the access servers. The access servers and SC2200 interact to set up and tear down calls using an extended Q.931 protocol over Q.921 and UDP. In this manner, the access servers and SC2200 form a system that emulates an end-office switch in the PSTN.
The Cisco SS7/C7 Dial Access Solution System uses the ISDN Q.931 and Q.921 protocols over a Redundant Link Manager (RLM) module. RLM makes use of the UDP protocol to transfer information from the NAS to the CSC and vice versa. The ISDN module works in conjunction with the RLM.
Restrictions
Do not use this and other SS7 dial access solution commands if you are using a PRI interface.
Related Technologies
The Cisco SS7/C7 Dial Access Solution System runs on the Cisco AS5200, AS5300, and AS5800 Access Servers in conjunction with the following Cisco technologies:
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Supported Platforms
The following hardware platforms support this feature:
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Prerequisites
The rlm group should have already been configured. If not, see the feature module titled Redundant Link Manager (RLM).
Supported MIBs and RFCs
None.
List of Terms
CSC—Cisco Signaling Controller. A server which interfaces between the NAS and the SS7 signaling network.
NAS—Network Access Server. A Cisco platform (or collection of platforms such as an AccessPath TS or TS3 system, which interfaces between the packet world (for example, the Internet) and the circuit world (for example, the PSTN).
RLM—Redundant Link Manager.
Configuration Tasks
None.
Command Reference
The isdn rlm-group command is added for this feature. All of those IP addresses associated with the redundant servers will be called an rlm-group. Multiple rlm-groups will be allowed in each NAS.
All other commands used with this feature are documented in the Cisco IOS Release 12.0 command references.
isdn rlm-group
The isdn rlm-group command allows RLM to be used as a way of transporting the D channel information (signaling) over Ethernet. Use this command to specify the rlm-group number that ISDN will start using. Use the no form of this command to disable this function.
isdn rlm-group number
no isdn rlm-group numberSyntax Description
Default
Disabled
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 12.0(2)T.
Sample Display
interface Serial0:23ip address 7.0.0.1 255.0.0.0encapsulation pppdialer map ip 7.0.0.2 name hawaii 1111111dialer load-threshold 1 eitherdialer-group 1isdn switch-type primary-niisdn incoming-voice modemisdn rlm-group 1ppp authentication chapppp multilinkhold-queue 75 in!Related Commands
clear interface
clear rlm group statistics
interface
link source weight
protocol rlm port
retry keepalive
server
show rlm group statistics
show rlm group status
show rlm group timer
shutdown
timerWhat to Do Next
For additional software configuration information, see the following publications:
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