Subject: [AVT] Questions regrading VoIP, RTP, and SDP

From: "A. Kholaif" <[email-masked]>
Date: Fri, 15 Jul 2005 00:58:15 -0400

Hi,

I've got a technical question. In current basic/standard RTP
implementations, if IP-based devices normally receive RTP packets every
20ms, would they be happy if packets with twice the voice payload
started arriving every 40ms instead? and does this require any
additional mid-call SDP re-negotiations?

Also, does SDP allows for negotiating and specifying different values
of the packetization interval <ptime> for the upstream and downstream
legs of the same RTP audio connection? In other words, is it possible
for an IP phone to send audio RTP packets every 40 ms while receiving
audio packets every 20 ms?

Ahmad 

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