3GPP owns the IMS specification, not the IETF. I know there was a recent
contribution to 3gpp for using STUN (and TURN and ICE) for NAT traversal.
In the IETF, STUN is a standard (RFC3489), TURN is being standardized in the
BEHAVE working group and ICE (which is related to STUN and TURN) is being
standardized in the MMUSIC working group. A list of working groups, their
documents, and their mailing list information is available from
As to 'are there more problems apart of RTP packets?', if you're asking if
NATs cause problems for things other than RTP, the answer is yes. The
BEHAVE working group is chartered to describe the best practices around NATs
(for the NATs and for applications that hope to run over them). For some
additional SIP specific techniques for dealing with NATs, see also
From: Ashfaaq H Poonawala [mailto:pashfaaq(_at_)hotmail(_dot_)com]
Sent: Thursday, October 19, 2006 9:11 AM
Subject: NAT TRAVERSAL IN SIP THROUGH IMS
I am a Masters Student at Southern Methodist University, Dallas TX.
I am doing a project on NAT traversal in SIP in the IMS
network. I am discussing the problems for the RTP packets
while NAT traversal. One of the solution to it is the STUN
and TURN servers.
I would really appreciate if I were to get more details in
it. Also are there more problems apart of RTP packets?
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