Did you fix this. I have a very similar issue that started today following a minot upgrade to CUCM (to fix a memory leak).
Since this fix i can not use dtmf from any cisco phone to enter conference ID. If i use the Lync client to dial in works fine. If i use PSTN dial in it works. If i use one of out PBX phones that are E1 connected to CUCM it works. All very strange.
Andy
Ah. We had an issue where CM8 wasn't using a media resource group where hardware and software resources both existed.
Are you seeing the DTMF fail on all calls? Every 3rd/4th/etc? Specific digits?
I would run a trace for the conference attendant to see if Lync even sees the digits being sent when this happen so you can narrow down if you should be looking in Lync or UCM.
Unless you're seeing some errors on your back-end SQL that match up with the timing of these events I would assume the issue is probably more on UCM. Definitely sounds like an MTP problem somewhere.
No solution although our workaround was to capture the bridge numbers as route patterns within call manager, and keep the call from Lync to CUCM instead of sending it out the PSTN and back in. This appears to have bypassed the issue for us.
I was having the same issue with Lync and my Cisco SIP trunk on CUCM 8. I'm finding that I have to provide a PVDM transcoder resource on my SIP trunk to Lync and Exchange Unified Messaging for certain outside SIP callers in order to get DTMF to work correctly. Be sure your media resource list on your trunk has a hardware (PVDM) transcoder available to it.
I'm having the same issue..did you found the problem?
In my cenario we have cisco 7.1 and lync 2010 with the latest CU
Hi,
I have the same similar issue, the DTMF is not sensing on second try. Mostly for 3 or 4 digit of the number.
Regards,
Vinodh
you mean the first Digit in DTMF is transmitted and received?
Had you tested this?
Hi,
I am also having same issue, we have recently integrated CUCM 8.1 with Lync 2010, issue is with DTMF, when i enable use MTP on SIP trunk, DTMF tones are not going thru if call is coming from a CUCM registered IP Phone, but all external (PSTN) calls work fine i.e DTMF goes through.
When i disable use of MTP then internal (CUCM IP Phone) starts working fine but external calls cannot even connect and i get the following error:
488 Invalid incoming Gateway SDP: Invalid media
Any help would be appreciated!
Thanks in Adavance
~Mani
did you fix this i'm having exactly the same issue . DTMF works on internal call without the MTP but breaks external calls.
pls let me know...
Environment: CUCM 8.5 SIP trunk to Lync 2013 to allow for dial in conferencing from internal callers and callers from PSTN.
Issues: Internal Cisco IP 796X phones DTMF tones not recognized by Lync and outside callers DTMF was ok. Disabling MTP on trunk broke out side calling (call failed completely). SIP/2.0 488 Invalid incoming Gateway SDP: Gateway ParseSdpOffer Error: No DTMF support on Gateway side - was the error on the trace on Lync 21013 server. However, disabling MTP required fixed the DTMF tone issue for internal callers from Cisco IP phones.
Resolution: on CUCM ->Trunk config: remove check for <label for="MTPREQUIRED">Media Termination Point Required </label>and on you -> SIP Profile config -> trunk specific configuration: remove the check for <label for="EARLYOFFERSUPPORTFORVOICECALL">Early Offer support for voice and video calls (insert MTP if needed) </label>.