[SIPForum-discussion] Offer-answer

[HM Kias]

So the call flow would  be like this on the answer/offer exchange


UAC                       UAS
|                              |
|INVITE Supported:rel100 Cseq:1 INVITE
|                                 |
| <------    100 Trying     |
|                                 |
| 180 Ringing CSeq:1 INVITE RSeq:314
|<------------------------------|
|                                |
|                                |
| 180 Ringing Rseq:314  |
|<------------------------------|
|                                |
|PRACK Cseq:2 PRACK RAck:314 INVITE
|------------------------------>|
|                                |
| 200 OK Cseq:2 PRACK |
|<------------------------------|
|                                |
|200 OK Cseq:1 INVITE  |
|<------------------------------|
|                                |
|ACK Cseq:1 ACK      |
|------------------------------>|



On Thu, Jun 30, 2011 at 3:55 PM, Ravi Ranjan Sinha
<ravi.sinha at aricent.com>wrote:

> Hello,
>
> Yes, there should not be any problem. The call flow is correct.
>
> Regards,
> Ravi Sinha
> ________________________________________
> From: discussion-bounces at sipforum.org [discussion-bounces at sipforum.org] On
> Behalf Of mrinal kuila [mrinal.80 at gmail.com]
> Sent: Wednesday, June 29, 2011 11:15 AM
> To: discussion at sipforum.org
> Subject: [SIPForum-discussion] Offer-answer
>
>  Hi  Forum,
>
> Coiuld you please answer my below question.
> Once offer answer is complete Is it possible to UAS to send more 18x
> responses?
>
>         UAC               UAS
>        |----INVITE------>|
>        |                 |
>         |<----18x (o)-----| - provisional responses with REQUIRE 100rel
>         |                 |
>         |-----PRACK(a)--->| - send PRACK with answer
>         |<---- 2xx--------|                 |
>          |                 |
>         |                 |
>         |<----18x --------| - >         |                 |
>        |-----PRACK------>|
>         |<----2xx---------|
>
>              200OK
>        <-----------------
>         ------------------>
>              ACK
>
>
> Regards
> Mrinal
>
>
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-- 
HM Kias
91-9443467600
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