[SIPForum-discussion] Regarding Unsupported URI

[lakhan patel]

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?
2. What should be the behavior of B2BUA when SUB-A doesn't ACK for 416?

Do we need to send ACK for every 4xx response?*

*In this scenario SUB-A sending unsupported URI in INVITE request, What
happen when it send unsupported URI in REGISTRATION itself?
Again do SUB-A need to ACK for 416?*

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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