VoIP configuration troubleshooting

Description:

This document describes the options for error analysis for VoIP configurations.

Procedures:

1) Check whether the SIP lines are registered with the provider:

1.1) Use the command ls /Status/Voice-Call-Manager/Line at the command line to output the status list of the configured SIP lines.

The most interesting columns here are Reg-status, Reg-state and Line-status.

In the interests of clarity, the following figure shows a Line table in WEBconfig.

2) Check whether SIP, analog and/or ISDN users are registered:

2.1) Use the command ls /Status/Voice-Call-Manager/User at the command line to output the status list of the configured SIP, analog and ISDN users.

In the interests of clarity, the following figure shows a User table in WEBconfig.

3) Check that calls are being routed to the correct lines:

3.1) Use the command ls /Status/Voice-Call-Manager/Calls at the command line to output the status list of all of the calls made.

The most interesting columns here are the From_Line and the Dest-Line. Here you can see which SIP line was used to route which internal user line (SIP, ANALOG or ISDN).

In the interests of clarity, the following figure shows a Call table in WEBconfig.

4) Perform traces for troubleshooting and analysis:

You can capture the following traces with the CLI command tr # <argument> to help with troubleshooting:

4.1) Problems when making a call using the SIP-ALG:

tr # error
tr # status
tr # firewall
tr # sip-alg
tr # sip-alg-packet
tr # ip-router

You can also output the following tables:

ls /Status/IP-Router/Connection-List
ls /Status/IP-Router/Establish-Table
ls /Status/Sip-Alg/Registrations
ls /Status/Sip-Alg/Calls

4.2) VoIP problems with an ISDN client:

tr # Callmanager
tr # D-channel-dump
tr # Q.931
tr # status
tr # error
tr # sip-packet
tr # PSTN-MNGMT

You can also output the following tables:

ls /Status/Call-Information
ls /Status/Connection
ls /Status/Voice-Call-Manager/Lines
ls /Status/Voice-Call-Manager/Calls
ls /Status/IP-Router/Connection-List
ls /Status/ISDN/Line/S0
ls /Status/ISDN/Framing/PCM-SYNC-SOURCE
ls /Status/ISDN/Framing/S0
ls /Status/ISDN/PCM-Switch/PCM-Connection
ls /Status/ISDN/Signaling/Layer-2/LAPD
ls /Status/ISDN/Signaling/Management/D-Info
ls /Status/ISDN/Signaling/Management/Error-Statistic
ls /Status/Info-Connection
ls /Status/Voice-Call-Manager/User

4.3) VoIP problems with an analog client:

tr # Callmanager
tr # D-channel-dump
tr # status
tr # error
tr # B-ANALOG
tr # DAA
tr # sip-packet
tr # SLIC
tr # Q.931

4.4) Problems when making a call (e.g. call establishment or disconnected calls):

tr # Callmanager
tr # D-channel-dump
tr # MEDIA
tr # MEDIA-CODECS
tr # MEDIA-PCM
tr # MEDIA-RT
tr # Q.931
tr # sip-packet

If the captured traces are no help with troubleshooting, please send them along with a description of the fault for assessment by LANCOM support. In the case of VoIP, you should always record Wireshark (LCOSCAP) traces from the sending and receiving interfaces.

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