You can check for SDP version of re-Invite, if its same as previous one
then its usually intended for session refresh.

Thanks,
-kashif

On Tue, 24 Sep 2019, 02:30 Sundbaum Per-Johan (Telenor Sverige AB), <
per-johan.sundb...@telenor.se> wrote:

> Hi !
> Can anybody help me find relevant RFC/other info on how UAS should handle
> re-INVITE that is intended as a session refresh and not for modifying the
> session ?
>
> SDP B1 in (3) is identical with SDP B1 in (5)
>
>
>
>                  Caller                        Callee
>                    |                             |
>                    |                             |
>                   |(1) INVITE with SDP A1       |
>                    |---------------------------->|
>                    |                             |
>                    |                             |
>                    |(2)  Trying                  |
>                    |<----------------------------|
>                    |                             |
>                    |                             |
>                    |(3) 200 OK with SDP B1       |         |
>                    |<----------------------------|
>                    |                             |
>                    |                             |
>                    |(4) ACK                      |
>                    |---------------------------->|
>                    |                             |
>                    |                             |
>                    |(5) (re)INVITE with SDP B1   |
>                    |<----------------------------|
>                    |                             |
>                    |                             |
>                    |(6) 200 OK with SDP ????     |
>                    |---------------------------->|
>
>
> Thanks !
> BR/pj
>
>
>
> Sensitivity: Internal
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