For what it is worth, rfc4291 section 2.5.2 indicates that the "unspecified 
address must not be used as the destination address of IPv6 packets or in IPv6 
Routing headers".

> -----Original Message-----
> From: Brett Tate
> Sent: Monday, February 07, 2011 7:10 AM
> To: 'bindukumari.r'; sip-implementors@lists.cs.columbia.edu
> Subject: RE: [Sip-implementors] Query on Handling of null ipv6 address
> in SDP c= line.
> 
> > What must be done when NULL IPv6 address in received
> > in SDP c= line,
> 
> No MUST behavior has been defined for the situation; it is not a hold.
> 
> The UAS received a request to communicate with a non
> reachable/responsive location.  If the UAS responds prior to the
> connection attempt, the UAS will likely send a 200 response with SDP
> reflecting typical offer/answer rules.  The non reachable/responsive
> location may subsequently cause the call to be released; however the
> UAS might be more forgiving if some media attributes (such as
> "inactive" and "sendonly") were used.


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