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IOS software MTP - DTMF behaviour

Hi everyone,

I'm having a strange issue using an IOS software MTP to propagate DTMFs inband to a SIP provider. When I'm in the middle of the conversation and i press a digit on my IP Phone, i hear 4 tones on the other side of the line.

This only happens when i use a 3825 ios as the MTP. Software or Hardware based.

If i use the CUCM 8.6 resources it works fine.

If i change the MTPs codec, forcing it to use the gateways trancoding resources, it works fine.

Running a "debug voice ccapi inout" I can see the dtmf being sent inband.

*Aug 14 17:43:18.015: //60/xxxxxxxxxxxx/CCAPI/cc_api_inband_msg_received:

   Payload=101, Event=1, Interface=0x651CA668, Call Id=60

*Aug 14 17:43:18.043: //61/xxxxxxxxxxxx/CCAPI/ccGenerateInbandMessage:

   Message Type=0x108, MSByte=0x3, LSByte=0x20

IOS version:

c3825-spservicesk9-mz.124-25f.bin

Any ideas?

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Community Member

IOS software MTP - DTMF behaviour

Solved with

c3825-spservicesk9-mz.124-24.T7.bin

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