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Any advice you could give me with would helpful. Of course they would never admit that since we are the only people having problems with it.

My gut says it is probably something on their end (maybe it is being too picky about the DTMF) but So I am at a loss of where to even start. I also tested a few other conference calling services we use and they recognize the DTMF without issue as well. I tested the number from my cell phone and directly from our CUCM and everything works as expected from those, so the issue is only with The calls connects successfully but onceĬonnected none of the DTMF is recognized (it isn't recognized incorrectly, it doesn't recognize we are pushing buttons).

I tested it from both a SfB phone and through the app and the same thing happens. We have a client that is using a conference calling service that won't recognize out DTMF digits once the call is connected. We have a SfB 2015 server and it has a SIP trunk set up to our Cisco Call Manager and all the calls route out through We are having problems with DTMF being recognized, but as far as I can tell it is only when calling one specific conference calling provider.

Cisco dtmf