[SIPForum-discussion] What is the function of telephone-event?

[Steve Langstaff]

"telephone-event" is a method for passing e.g. DTMF signalling in an RTP
stream.
 
The "101" (or any payload type in the range 96-127) refers to a dynamic
payload type.
 
So a stream that negotiates to use "101 telephone-event" may e.g. pass
keypresses
using RTP payload type 101 rather than "in-band".
 
The risks you face in removing telephone event support are that if you
are using a
low bitrate codec such as G.729, or you are using equipment that does
not expect
to see DTMF "in-band" then users may lose the ability to control e.g.
IVR equipment.


________________________________

	From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Andrea Puddu
	Sent: 06 March 2008 12:15
	To: discussion at sipforum.org
	Subject: [SIPForum-discussion] What is the function of
telephone-event?
	
	
	Hello guys,
	
	as the network here does not completely support "telephone
event" in SDP they asked me to set up phones to not include "telephone
event".
	I have looked at some RFCs .... but I couldn't understand what
the telephone events are useful to.
	
	Do you see any risk to remove the telephone event, in particular
the 101 telephone event?
	
	thanks 1000.
	
	Andrea
	

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