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Change PRI's to In-Band Call Signaling

Answered Question
Mar 26th, 2012
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Hello Voice Guru's,


I have an request from our server team. We have a program that when someone calls into from the PSTN and leaves a message the program will call out via our PRI's.


We have been having sporadic issues with this program and finnally got ahold of the vender and they ran a wireshark trace. According to them we are using out of Band signaling and the program works better when it uses in-band signaling.


We currently have several PRI's that terminate on an H.323 Cisco 2911 gateway running c2900-universalk9-mz.SPA.150-1.M5.bin. It seems to me that calls coming in-bound from the PSTN that I could change to in-band call signaling on the dial-peer ( I seem to rember there may be a command that can change that on the dial-peer)  but, I'm unsure how I could accomplish this on the calls going out from the server to the PSTN.


It seems to me that is the whole purpose of PRI's is that you have one channel for call signaling out of band.


Would this be possible?


Thanks,


Dan

Correct Answer by paolo bevilacqua about 5 years 4 months ago

Under DP:

dtmf-relay


based on you description, method should be 'rtp-nte', that is also the most used generally.


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Gajanan Pande Mon, 03/26/2012 - 22:37
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Dan,


Not sure what that program is but enabling MTP can help in this band conversion. Did you try that ?


GP.


Pls rate helpfuls posts !!

dan hale Tue, 03/27/2012 - 10:19
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HI Paolo,


I thought PRI's natively use out-of-band for call signaling.


23 B channels for data and 1 D channel for Call Signaling.

paolo bevilacqua Tue, 03/27/2012 - 17:36
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Yes. I had mistyped my post above.

If you describe the problem with the full details and call flow, it may be better understood.

dan hale Thu, 04/05/2012 - 14:01
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Hello, we have five PRI's that terminate on a cisco 2911 Cisco router using H.323


We have a sigle site deployment with one CM 4.x Publisher and one Subscriber.


Below is the dial-peer that matches the extension and sends it to the server.


dial-peer voice 9992290 voip

destination-pattern 5252

session protocol sipv2

session target ipv4:10.0.0.69

session transport udp

codec g711ulaw

no vad


This extensions goes to a menu where users can play prompts via the dial pad on there phone. It is reported on certain occasions that a user presses a number on the dial pad but, the system does not recognize or go through.


I spoke with the vender that makes the software and they had said they thought we needed to change the call signaling to in-band for the DTMF tones.


It seems to me that I should be able to some how alter the dial-peer to maybe help DTMF along?


thanks,

Dan

Correct Answer
paolo bevilacqua Thu, 04/05/2012 - 14:08
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Under DP:

dtmf-relay


based on you description, method should be 'rtp-nte', that is also the most used generally.


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dan hale Tue, 04/10/2012 - 10:53
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Hi Paolo,


I added in the dial-peer:


dtmf-relay rtp-nte sip-notify


As reccommended. I have not had a call back from the vendor so I'm thinking that may have helped.

paolo bevilacqua Tue, 04/10/2012 - 10:58
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Thanks for the nice rating and good luck!

paolo bevilacqua Tue, 03/27/2012 - 01:39
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There is no "in-band" calling on PRI.

You can discuss that with your wireshark expert, show them the trace on the router tha does ALL outbound calls via IDSN q.931.

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