Hi,
Yes Require header suffices, for the UAC to send PRACK. No need of
supported header. Supported header may be present to indicate the other
option-tags supported/
Regards
Satyakumar
Technical Lead | HelloSoft India Pvt Ltd., |
www.hellosoft.com | Hyderabad, IN | +91-04023327062
----- Original Message -----
From: "SungWoo Lee" <[email protected]>
Cc: <[email protected]>
Sent: Thursday, July 22, 2010 5:32 AM
Subject: [Sip-implementors] PRACK issue
> Dear,
>
> Is it possible for a reliable provisional response to have an empty
> Supported header and a Require: 100rel header at the sametime? In this
> case, is the Require header supposed to have a higher priority than
> Supported header, and thus PRACK should be sent anyway?
>
> A sample 180 response is as follows.
>
> SIP/2.0 180 Ringing
> ..........
> Supported:
> Require: 100rel
> RSeq: 402604517
> Allow: ACK,BYE,CANCEL,INFO,INVITE,OPTIONS,PRACK,REFER,NOTIFY,UPDATE
> ..........
>
> Thanks,
> Sungwoo
>
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> [email protected]
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