On Thu, Aug 06, 2009 at 05:27:10PM +0530, Abhishek Dhammawat wrote:
> Hi
>
> In my opinion RBT(Ring Back Tone) should be played.
>
> regards
> Abhishek Dhammawat
>
Since nobody has mentioned RFC 3960 I thought it would be appropriate to
quote a portion of section 3.2[1].
With this in mind, a UAC should develop its local policy regarding
local ringing generation. For example, a POTS ("Plain Old Telephone
Service")-like SIP User Agent (UA) could implement the following
local policy:
1. Unless a 180 (Ringing) response is received, never generate
local ringing.
2. If a 180 (Ringing) has been received but there are no incoming
media packets, generate local ringing.
3. If a 180 (Ringing) has been received and there are incoming
media packets, play them and do not generate local ringing.
Note that a 180 (Ringing) response means that the callee is
being alerted, and a UAS should send such a response if the
callee is being alerted, regardless of the status of the early
media session.
I think 3 above answers the original question about local ringtone
generation.
/Mikael
[1]http://tools.ietf.org/html/rfc3960#section-3.2
> 2009/8/6 Abhishek Dhammawat
> <abhishek.dhamma...@aricent.com<mailto:abhishek.dhamma...@aricent.com>>
> Hi
>
> I would request you not to remove the original question from the mail chain
> for better understanding of the issue I am putting the question by Miguel
> orielly again
>
>
> "I am wondering if the below scenario is valid or not.
>
> <-- 183 (with SDP) then,
> <-- 180 (without SDP)
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