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List:       sip-implementors
Subject:    Re: [Sip-implementors] offer-questions.
From:       Paul Kyzivat <pkyzivat () alum ! mit ! edu>
Date:       2015-10-19 17:35:44
Message-ID: 562529F0.3090201 () alum ! mit ! edu
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Trimming

On 10/19/15 1:12 PM, K sipuser wrote:

> - INVITE with codec1,codec2,codec3
> - 183 received with codec2.
> - Update *send* with codec4
> - In early dialog state is this valid?
>
> How is this different from (2)? The only difference I see is *received*
> vs. *sent*. But every message received must have been sent.
>
> Is (2) assuming the update is opposite direction to invite, while in (3)
> the update is in the *same* direction as the update?
>
> In any case, my comments on (2) also apply to (3).
>
> Adi>>I mean in both the case2 and case3 , 183 is send reliably

OK. Then the UPDATE is ok.

>  >>if SUT does not like codec4, can it reject with 4xx response in early
> dialog state?

Yes.

>  >>will that end the call?

No.

>  >>can it continue with codec2 after sending a failure response?

Yes.

>  > 4)INVITE with codec1,codec2,codec3200 OK received with codec2.--call
> is connectedUpdate Received with codec4
>
> - INVITE with codec1,codec2,codec3
> - 200 OK received with codec2.
> - call is connected
> - Update Received with codec4
>
> Yes, this is fine. But the recipient of the update can reject it and
> continue the call with codec2.
>
> The sender of the update needs to be prepared to receive either codec2
> or codec4 until the response to the update is received. He should keep
> sending codec2 until he knows whether codec4 has been accepted.
>
>  > 5) if SDP offer has RR and RS=0.can answer be non-zero RR and RS?RR
> in offer should be equal to RS in answer right?
>
> I don't know what RR and RS mean in this context.
> In general, in SDP we have RR and RS.

I still don't know what you mean by "RR" and "RS". I presume they are 
acronyms for something, but what?

	Thanks,
	Paul
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