[SIPForum-discussion] Contact header can be NULL

[Murali Natesh]

Hello Nitin,

Hope you are doing well,

*As per RFC 3261  section 8.1.1.8 Contact*

The Contact header field provides a SIP or SIPS URI that can be used
to contact that specific instance of the UA for subsequent requests.
The Contact header field MUST be present and contain exactly one SIP
or SIPS URI in any request that can result in the establishment of a
dialog. For the methods defined in this specification, that includes
only the INVITE request. For these requests, the scope of the
Contact is global. That is, the Contact header field value contains
the URI at which the UA would like to receive requests, and this URI
MUST be valid even if used in subsequent requests outside of any
dialogs.
If the Request-URI or top Route header field value contains a SIPS
URI, the Contact header field MUST contain a SIPS URI as well


I hope it clears your query.


-- 


*Thanks and RegardsMurali*


On Thu, May 8, 2014 at 8:17 PM, nitin jain <nitincs2006 at gmail.com> wrote:

> Hello team,
> Is it possible that contact header is NULL ?
> What will be the use of this ?
>
> How ACK will go to other client ?
>
> Thanks in advance.
>
> BRs,
> Nitin
>
> _______________________________________________
> This is the SIP Forum discussion mailing list
> TO UNSUBSCRIBE, or edit your delivery options, please visit
> http://sipforum.org/mailman/listinfo/discussion
> Post to the list at discussion at sipforum.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20140510/072442bd/attachment-0002.html>