Technical Summary
Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs) are
often designed to be on the media path, rather than just intercepting
signaling. This means that B2BUAs often act on the media path leading
to separate media legs that the B2BUA correlates and bridges together.
When acting on the media path, B2BUAs are likely to receive Session
Traversal Utilities for NAT (STUN) packets as part of Interactive
Connectivity Establishment (ICE) processing. It is critical that B2BUAs
handle these STUN messages properly.
This document defines behavior for a B2BUA performing ICE processing.
The goal of this document is to ensure that ICE used for NAT and
Firewall traversal of multimedia sessions works when there are B2BUAs in
place and the B2BUAs handle STUN messages properly.
Working Group Summary
The WG path of this document was reasonably short and efficient. Several
technical comments were made during reviews and all were resolved with
consensus.
There is consensus in the STRAW WG to publish this document.
Document Quality
The guidelines and procedures in the document is based on input and
experience from the implementer community.
Personnel
Document Shepherd: Victor Pascual
Responsible AD: Ben Campbell