Subject: RE: [Sip] SDP query

From: "Scott Godin" <[email-masked]>
Date: Wed, 7 Sep 2005 13:23:47 -0400

This is valid.  It is not required that both ends send/receive using the
same payload ID.  

The payload id you send in an SDP is what you should expect to receive
from the far end.  Likewise the far-end should expect to receive the
payload id it advertised in it's SDP.  

________________________________

From: [email-masked] [mailto:[email-masked]] On Behalf Of
[email-masked]
Sent: Wednesday, September 07, 2005 12:58 PM
To: SIP Implementors
Cc: SIP IETF
Subject: [Sip] SDP query

Hi, 

Just want to know if following offer-answer exchange is correct, it has
different dynamic payload types for DTMF and telephone events, 
is it necessary for both these to be same ? 
If they are not same, then how both parties will use these values to
send telephone-events and DTMF digits. 

Offer: 
m: audio 8000 RTP/AVP 18 0 96 
rtpmap: 18 G729/8000 
rtpmap: 0 PCMU/8000 
fmtp:96 0-15 
rtpmap:96 telephone-event/8000 

Answer 
m: audio 8000 RTP/AVP 18 0 96 97 
rtpmap: 18 G729/8000 
rtpmap: 0 PCMU/8000 
fmtp:96 0-15 
rtpmap:97 telephone-event/8000 

Thanks, 
Udit 

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