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New Member

No Ringback

We have a call flow of CUCM 7.1 IP phone --- GK controlled ICT --- GK -- matched default tech prefix ---- voice gateway --- QSIG trunk --- PBX --- destination phone .

Calls complete but with no ringback before called party picks up.  Debug q931 on the voice gateway with the QSIG trunks shows the call set up with progress indicator indicating ring back is sent be we don't hear it.  Any ideas appreciated!

*Nov  9 15:17:59.917: ISDN Se1/0/0:23 Q931: TX -> SETUP pd = 8  callref = 0x1C79
Bearer Capability i = 0x8090A2
Standard = CCITT
Transfer Capability = Speech 
Transfer Mode = Circuit
Transfer Rate = 64 kbit/s
Channel ID i = 0xA98382
Exclusive, Channel 2
Calling Party Number i = 0x0081, '4686328608'
Plan:Unknown, Type:Unknown
Called Party Number i = 0x80, '900496142754857'
Plan:Unknown, Type:Unknown

*Nov  9 15:18:00.021: ISDN Se1/0/0:23 Q931: RX <- CALL_PROC pd = 8  callref = 0x9C79
Channel ID i = 0xA98382
Exclusive, Channel 2
*Nov  9 15:18:01.369: ISDN Se1/0/0:23 Q931: RX <- ALERTING pd = 8  callref = 0x9C79
*Nov  9 15:18:53.465: ISDN Se1/0/0:23 Q931: TX -> DISCONNECT pd = 8  callref = 0x1C79
Cause i = 0x8090 - Normal call clearing
*Nov  9 15:18:53.497: ISDN Se1/0/0:23 Q931: RX <- RELEASE pd = 8  callref = 0x9C79
*Nov  9 15:18:53.509: ISDN Se1/0/0:23 Q931: TX -> RELEASE_COMP pd = 8  callref = 0x1C79


Re: No Ringback

Can you post a copy of your voice gateway with the QSIG PBX?  Typically it has something to do with the the Dial Peer confg, (adding a statement for ring back) or at the CUCM side making sure that Early Media offer (I think, cant recall) is checked.

New Member

Re: No Ringback

Hi Tommer,

I've attached the config.  The two dial-peers we are hitting are:

dial-peer voice 130 pots
description Cisco to Nortel
numbering-type unknown
preference 1
destination-pattern [1-9].T
port 1/0/0:23
forward-digits all
prefix 900

dial-peer voice 2000 voip
description From Cisco GK
call-block translation-profile incoming Block
voice-class codec 1
voice-class h323 1
incoming called-number .
dtmf-relay h245-alphanumeric
ip qos dscp cs3 signaling



Cisco Employee

Re: No Ringback

You might want to check out the progress_ind commands, and "tone ringback alert-no-pi", at the following URL:

Re: No Ringback

Yeah, that was the doc I was thinking of. I have some other notes in the

forums as well. I had the same setup. CUCM 7.x