[SIPForum-discussion] Can 180 be sent with Require:100rel and RACK header without SDP

[Bharat Sarvan]

UAS MAY send SDP in the reliable provisional response, if the received
INVITE contained an Offer.

If the UAC receives a reliable provisional response with an offer
(this would occur if the UAC sent an INVITE without an offer, in
which case the first reliable provisional response will contain the
offer), it MUST generate an answer in the PRACK.  If the UAC receives
a reliable provisional response with an answer, it MAY generate an
additional offer in the PRACK.  If the UAS receives a PRACK with an
offer, it MUST place the answer in the 2xx to the PRACK.

However if the reliable provisional response is the first reliable message
sent back to the UAC, and the received INVITE did not contain an Offer,
SDP MUST be present in the reliable provisional response.

-Bharat

On Wed, May 26, 2010 at 12:58 AM, Rambabu Achary <getram123 at gmail.com>wrote:

>
>
> Can UAS send 180   with Require:100rel and RACK header without SDP if it
> receivis INVITE with Supported header contains 100rel
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