[asterisk-dev] why 4 UDP ports per SIP call?

[Dmitry Andrianov]

Udptl (T38 fax)?

-----Original Message-----
From: asterisk-dev-bounces at lists.digium.com
[mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of Klaus
Darilion
Sent: Monday, November 19, 2007 10:54 PM
To: Asterisk Developers Mailing List
Subject: [asterisk-dev] why 4 UDP ports per SIP call?

Hi!

Analyzing Asterisk I see 4 new UPD sockets opened by Asterisk per 
incoming SIP call. I would assume RTP+RTCP=2, but why are there 4 ports 
opened?

thanks
klaus



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