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New Member

Local Call Delay before Ringback.

Let me first start off by saying that I am almost positive this problem does not have to do with dial-pattern matching on the callmanager.

I have an interesting problem when calling long distance or toll-free #'s I get ringback almost instantaneously. When calling local 10digit numbers it can take up to 12 seconds to hear ringback and place the call.

The calls go from 7960 to Call-Manager to 3640 Gateway to Avaya PBX to PSTN

I jumped on the Gateway and debugged ISDN Q931 with the TAC and noticed an interesting difference.

Short call setup Called 918005311111

*Jan 12 05:53:41.658: ISDN Se1/0:23: RX <- CALL_PROC pd = 8 callref =0xBBDD

*Jan 12 05:53:41.658: Channel ID i = 0xA98394

*Jan 12 05:53:42.454: ISDN Se1/0:23: RX <- PROGRESS pd = 8 callref =0xBBDD

*Jan 12 05:53:42.454: Progress Ind i = 0x8A81 - Call not end-to-end

ISDN, may have in-band info

Long call setup Called 97703311111

*Jan 12 04:04:13.023: ISDN Se1/0:23: RX <- CALL_PROC pd = 8 callref =0xBB92

*Jan 12 04:04:13.023: Channel ID i = 0xA98395

*Jan 12 04:04:18.675: ISDN Se1/0:23: RX <- ALERTING pd = 8 callref =0xBB92

*Jan 12 04:04:18.675: Progress Ind i = 0x8488 - In-band info or

appropriate now available

As you can see by the time-stamps this is about a 5 sec difference. So this might only be one piece of the problem. We didn't have this issue until about 2 weeks ago.

The TAC has indicated that the problem is on the Avaya PBX, but our group says nothing has changed. The VoIP group says nothing should have changed. So that only leaves the provider. Local calls go out BellSouth and LD goes out AT&T.

I am confused about how to troubleshoot this further. Anyone have ideas?

3 REPLIES
New Member

Re: Local Call Delay before Ringback.

Here's a suggestion:

Check on the Avaya PBX (with debugs), when the Alerting from the PSTN arrives and when the Alerting is passed on to the 3640 gateway. If the Alerting is already arriving late from the PSTN, then you need to contact your carrier to know what they might have changed.

Thanks

Nandini

Cisco Employee

Re: Local Call Delay before Ringback.

Greetings Leonard,

I believe you are encountering a recently changed behavior in CCM. CCM used to cut through audio when any progress indicator was received, well this has recently changed so we only cut through on PI=8. Try configuring this on your POTS dial-peer that is matched to send the call to the PBX:

progress_ind alert enable 8 <----------- Hidden command

progress_ind progress enable 8

progress_ind connect enable 8

This will force the gateway to send PI=8 back to CCM with any alert/progress/connect command instead of the PI=1 received from the PBX.

/Wes

New Member

Re: Local Call Delay before Ringback.

But the alert isn't coming back from the PBX for 5-6 seconds. So it can't process the alert and cut through audio.

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