[Sip] Draft revision on SIP UA discovery using Zeroconf

Hi,

We have revised the draft on distributing SIP URIs within a LAN using  
DNS-SD (aka Zeroconf or "Apple Bonjour").  It incorporates the  
feedback on the previous version we received through the mailing  
lists and in the IETF 68.  The list of changes from the previous  
version and the link to the IETF slides are included below.  Feedback  
is most welcome.

    Title      : SIP URI Service Discovery using DNS-SD
    Author(s)  : J. Lee, H. Schulzrinne, W. Kellerer, Z. Despotovic
    Filename   : draft-lee-sip-dns-sd-uri-01.txt
    Pages      : 22
    Date	      : 2007-5-14

    This document describes the Session Initiation Protocol Uniform
    Resource Identifier (SIP URI) advertisement for DNS-based Service
    Discovery (DNS-SD).  Using this mechanism, a SIP user agent (UA) can
    communicate with another UA even when no SIP registrar is available,
    as in a wireless ad-hoc network for example.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-lee-sip-dns-sd-uri-01.txt

The slides from the IETF 68 can be found at:
http://www3.ietf.org/proceedings/07mar/slides/sip-11.pdf

CHANGES from version 00
------------------------
* Expanded "Security Considerations" (section 9)

* New "Other Related Mechanisms" (section 7)
   - Comparison to SIP multicast
   - "sip" service type used by Asterisk and Ekiga
   - P2PSIP

* Changes in the "User Agent Client Behavior"
   - Request-URI set from the contact attribute (section 5.1)
   - RFC3263 not followed in resolving host names (section 5.2)

* New "DNS-SD/mDNS Overview" (section 3)

* References to the Contact header parsing rules (section 4.2.3)

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