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?
