signalization debugging

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Aug 6th, 2008
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Hi, Im troubleshooting signalization between CCM 4.2 and cisco voice GW (3825). I assume that there is problem in codecs but I cannot find any type of debugging on GW router which can show me what codec were offered for this call from CCM. I tried these debugs and I dont see it.


AnnexG Event Messages debugging is on


H.225 Event Messages debugging is on

H.225 Q931 IE Details debugging is on


H.245 Event Messages debugging is on

can somebody give me clue?

Thanks a lot.

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Jaime Valencia Wed, 08/06/2008 - 07:18
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are you using H323????

i would rather user a debug voip ccapi inout than those to see the capabilities



if this helps, please rate

tprochazka Wed, 08/06/2008 - 08:21
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yes, I use H323, I tried debug you wrote here, but still dont see codecs which are offered...

Michael Owuor Wed, 08/06/2008 - 08:40
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Hi Thomas,

Try 'debug h245 asn', which will show what capabilities the parties exchange. Here is a sample output. From the gateway's perspective, what is offered would be in an incoming Terminal Capabilities Set message. Within that message, look for the capabilitytable section for the list of codecs offered.

BR2#deb h245 asn

H.245 ASN1 Messages debugging is on


BR2#sh deb


H.245 ASN1 Messages debugging is on

Aug 7 16:25:02.109: H245 MSC INCOMING PDU ::=

value MultimediaSystemControlMessage ::= request : terminalCapabilitySet :






capabilityTableEntryNumber 1

capability receiveAudioCapability : g722-64k : 60



capabilityTableEntryNumber 2

capability receiveAndTransmitUserInputCapability : dtmf : NULL



capabilityTableEntryNumber 3

capability receiveAndTransmitUserInputCapability : basicString : NULL



capabilityTableEntryNumber 44

capability receiveAndTransmitUserInputCapability : hookflash : NULL


Hope this heps.




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