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Cisco Bug: CSCtd94341 - Marker bit is not set in the RTP packet w/ an RFC2833 DTMF event

Last Modified

Jun 05, 2010

Products (1)

  • Cisco UC Integration(TM) for Microsoft Office Communicator

Known Affected Releases


Description (partial)

DTMF is not working when using softphone client from CSF (like cucimoc leverages). Dtmf from hardphone control is working ok.

CUCIMOC from before 8.0. In sniffer trace you will see that marker bit of the first RFC2833 packet is not set. This is not compliant with RFC which may make the remote device ignore the DTMF packets.
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