User's Manual
Avaya B179 SIP Conference Phone Installation and Administration Guide
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RFC 2833 is a method of carrying DTMF signals in RTP packets using a separate RTP payload
format. With this method a PSTN gateway reproduces the DTMF tones sent from the end
device.
With SIP Info the DTMF signals are sent as SIP requests. The SIP switch creates the tones if the
call is transferred to the PSTN.
Use RFC 2833 or SIP Info as preferred methods. Switch to inband only if you encounter prob-
lems using DTMF signalling with your PBX/SIP switch.
On phone: > SETTINGS > ADVANCED > (PIN) > MEDIA > DTMF SIGNALLING (6,2,4,3).
Advanced
First RTP port If the RTP packets must be directed to a specic port series, the rst
port number is set here.