[Sip] Can we use From Header's value to build Contact in REFER

[<sunil.bhagat at wipro.com>]

Hi All.

 

I have a small query regarding the Contact Header while building a REFER message.

RFC 3515 specifies that Contact Header is mandatory in REFER message.

If Contact Header is missing in REFER, can we populate its value from the “From” Header?

 

If yes, Can the same be done for SUBSCRIBE and NOTIFY messages?

 

Thanks,

Sunil