[cisco-voip] SIP peers to UCM and DTMF

[Brian Meade (brmeade)]

Adam,

Some of the phone models don't play the RFC 2833 inband DTMF tones audibly so that may be what you're seeing.  You'll probably need a packet capture to ensure the RTP events are being sent to the phone.

You shouldn't need to use MTP Required as an MTP will be dynamically pulled in for a DTMF mismatch.

Brian

-----Original Message-----
From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Pawlowski, Adam
Sent: Tuesday, February 04, 2014 4:29 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] SIP peers to UCM and DTMF

Sorry if this one has been asked recently, but, what's the recommended configuration of the peers/trunk for SIP between an ISR gateway and a UCM (v9.1)? 

I have it set as rtp-nte which appears to work from the desk set -> pstn with no trouble, and PSTN inbound to Unity Connection or UCCX. I can see the messages generated in debug when I hit DTMF from the PSTN towards the desk set but no tone/beep is generated there. As well, I read that the older phones do not support rtp-nte, so I would need to have MTP required checked on the trunk for all calls? 

Just trying to make sure I have this all straight. 

Thanks,

Adam P
SUNYAB

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