[SIPForum-discussion] Regarding Unsupported URI

[lakhan patel]

Hi Ravi,

Thanks a lot for your help, :)

Can you please explain me why we need ACK in case of INVITE and why not for
REGISTRATION ?

And yes if you have any document or any reference please forward it to me on
my personal mail-id.

On Fri, Feb 12, 2010 at 2:54 AM, Ravi Ranjan Sinha
<ravi.sinha at aricent.com>wrote:

>  Hello,
>
> Please find my view online.
>
>
> *Regards,*
>
> *Ravi SINHA*
>
>
>   ------------------------------
> *From:* discussion-bounces at sipforum.org [discussion-bounces at sipforum.org]
> On Behalf Of lakhan patel [lakhan.p at gmail.com]
> *Sent:* Thursday, February 11, 2010 10:46 PM
> *To:* SIP Forum
> *Subject:* [SIPForum-discussion] Regarding Unsupported URI
>
>  Hi All,
>
>
>                                               SUB A
> B2BUA              SUB B
>                                                    |    REGISTER
> |                        |
>
> |----------------------->|                        |
>                                                    |     200 OK
> |                        |
>
> |<-----------------------|                        |
>                                                    |
>    |     REGISTER   |
>                                                    |
>   |<----------------------|
>                                                    |
>   |      200 OK       |
>                                                    |
>    |---------------------->|
>   Receive an INVITE request           |  INVITE W/SDP|
>               |
> with Unsupported URI scheme       |----------------------->|
>               |
>                                                    | 416 Unsupp URI|
>                 |
>     Sends a 416 Unsupported          |<----------------------|
>                 |
>         URI scheme response           |                         |
>                 |
>
>
> In this call flow SUB-A is sending INVITE request with unsupported URI for
> that SUB-A receive  "416 Unsupported URI scheme,
>
> *1. Can any one tell me, Do SUB-A need to send ACK  for 416?*
>
> *>>>>>Ideally yes. If Ack will not be received by B, it will retransmit
> the 4xx response.*
>
> 2. What should be the behavior of B2BUA when SUB-A doesn't ACK for 416?
> >>>>>>>If Ack will not be received by B2BUA, it will retransmit the 4xx
> response.
>
>
> Do we need to send ACK for every 4xx response?
> >>>>>>Yes
>
>
> *In this scenario SUB-A sending unsupported URI in INVITE request, What
> happen when it send unsupported URI in REGISTRATION itself?*
> *>>>>>>Registration will not be done for A.*
> *
>
> Again do SUB-A need to ACK for 416?
> *
> >>>>ACK is only for INVITE.
>
> Thank you all in advance for responding my query :)
>
> --
> Thanks & Regards
> Shivlakhan Patel
> Email: lakhan.p at gmail.com, lakhan.p at hotmail.com
> IBM India Private Ltd. Bangalore
> Contact: +91-9902791177
>
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-- 
Thanks & Regards
Shivlakhan Patel
Email: lakhan.p at gmail.com, lakhan.p at hotmail.com
IBM India Private Ltd. Bangalore
Contact: +91-9902791177
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