[SIPForum-discussion] Question on via and contact headers

Subhasish Panda pandasubhasish at gmail.com
Mon Dec 29 12:33:08 UTC 2014

via header is used for RESPONSE routing.

contact is mandatory for invite request and it is used for directly sending

On Wed, Dec 24, 2014 at 10:21 PM, shuaib ahmad <shuaib.pantnagar at gmail.com>

> Hi All,
> As we know via header contains address of hub through which it is
> being passed to destination and destination would send back response
> of request using via header entries. Contact header is used to send a
> request(Re-INVITE, BYE)after first INVITE. If we do not include
> contact header in INVITE, we are not able to send BYE( we do not get
> 200 OK).
> My question here is if we have via header to send response back to
> source then why do we need contact header in INVITE ?
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Subhasish panda
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