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Community Member

A VoIP call be drop,ISDN Disconnect Cause Codes is "Temporary failure"

When I initial a call form remote site(Phone1). Phone1--PSTN1 -->T1(E&M)-->VoiceGW1------>VoiceGW2-->ISDN-PRI-E1-NET5-->PSTN2--Phone2

The call disconnect and get ISDN Q931 messages "TX --> DISCONNECT" and Disconnect Cause Codes is "Temporary failure" in VoiceGW2 after connect 15sec.

But when I initial a call from local(Phone2) to remote is OK.

3 REPLIES
Cisco Employee

Re: A VoIP call be drop,ISDN Disconnect Cause Codes is "Temporar

There may be a negotitation issue between VGW1 and VGW2. Are they communication via H.323 or SIP?

If H.323, collect the following debugs,

From VGW1,

debug voip ccapi inout

debug vpm signal

debug h225 asn1

debug h245 asn1

debug ip tcp transaction

debug h225 q931

From VGW2,

debug voip ccapi inout

debug isdn q931

debug h225 asn1

debug h245 asn1

debug h225 q931

debug ip tcp transaction

If SIP,

From VGW1,

debug voip ccapi inout

debug vpm signal

debug ip tcp transaction

debug ccsip message

From VGW2,

debug voip ccapi inout

debug isdn q931

debug ip tcp transaction

debug ccsip message

Please also include the following output from each gateway,

show version

show run

show voice dsp detail

show voice dsp group all

show voice call summary

show diag

-Felipe

Community Member

Re: A VoIP call be drop,ISDN Disconnect Cause Codes is "Temporar

pls see attache files.

Cisco Employee

Re: A VoIP call be drop,ISDN Disconnect Cause Codes is "Temporar

Looks as though not all the debugs were collected. I don't see the output of "debug ip tcp transaction" it looks like the TCS from GW1 is not making it to GW2. This causes media negotiation to fail. Is it possible to get a packet capture of the call off of the GW2?

-Felipe

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