[SIPForum-discussion] Ringing / Session Progress (180/183)

[Donald Lee]

I think you are partly right.
In many scenarios that after receiving the 183 response and doing a
PRACK procedure, another 180 response arrive. In this case, if the RTP
stream is also sending back, then the originator needn't generate
local ring back tone, otherwise it should play itself.

But according to my understanding and the practicality, no matter 183
or 180 responses that received, the UAC should not generate the ring
back tone if there is RTP stream incoming. It's color ring back tone.

On Jan 10, 2008 7:04 AM, Ramesh Chauhan <chauhan_delhi at yahoo.com> wrote:
> Hi,
>
> Can you please tell me the diference between Ringing(180) and Session
> progress(183).
>
> As per me, if we recieve Session Progress(183), then our media will start
> flowing from farend to us and from us to farend. and if we receive
> Ringing(180) then our device will generate his own ring on the phone.
> Eg:
> Session Progress(183):
> Callee                          SIPProxy                          Caller
>       ----------Invite--------------->
>                                            ----------Invite--------------->
>                                            <--------Trying--------------
>       <--------Trying--------------
>                                            <--SessioProgress(183)-
>       <--SessioProgress(183)-
>       --------Here we will receive RTP from-------------------
>
> Ringing (180):
> Session Progress(183):
> Callee                          SIPProxy                          Caller
>       ----------Invite--------------->
>                                            ----------Invite--------------->
>                                            <--------Trying--------------
>       <--------Trying--------------
>                                            <--ringing(183)------------
>       <--ringing(183)------------
>       --------Here our device will generate local ring-----------
>
> Am I correct ???????????/
>
>
> Regards
> Chauhan
>
>
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-- 
BR
Donald