[SIPForum-discussion] Regarding 180 ringing

[Garron, James]

Interesting question.  

 

I believe that once you receive the provisional response putting the
call into the proceeding state you would reset Timer B (T1*64), and that
the call would stay in the proceeding state until receiving a final
response of until Timer B is expires.  Of course if there were a
retransmission of the provisional response that would reset Timer B
again.

 

Jim

 

 

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of vijay kant gupta
Sent: Tuesday, May 05, 2009 1:48 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Regarding 180 ringing

 

Hi ,

My question is 

Q if uac receive 180 ringing and he didn't get any final response "under
proceeding state so at that time which timer get expire and what is the
duration for that timer?


Fig:--

                               |INVITE from TU

             Timer A fires     |INVITE sent

             Reset A,          V                      Timer B fires

             INVITE sent +-----------+                or Transport Err.




               +---------|           |---------------+inform TU

               |         |  Calling  |               |

               +-------->|           |-------------->|

                         +-----------+ 2xx           |




                            |  |       2xx to TU     |

                            |  |1xx                  |

    300-699 +---------------+  |1xx to TU            |

   ACK sent |                  |                     |




resp. to TU |  1xx             V                     |

            |  1xx to TU  -----------+               |

            |  +---------|           |               |

            |  |         |Proceeding |-------------->|




            |  +-------->|           | 2xx           |

            |            +-----------+ 2xx to TU     |

            |       300-699    |                     |

            |       ACK sent,  |                     |




            |       resp. to TU|                     |

            |                  |                     |      NOTE:

            |  300-699         V                     |

            |  ACK sent  +-----------+Transport Err. |  transitions




            |  +---------|           |Inform TU      |  labeled with

            |  |         | Completed |-------------->|  the event

            |  +-------->|           |               |  over the action




            |            +-----------+               |  to take

            |              ^   |                     |

            |              |   | Timer D fires       |

            +--------------+   | -                   |




                               |                     |

                               V                     |

                         +-----------+               |

                         |           |               |




                         | Terminated|<--------------+

                         |           |

                         +-----------+



                 Figure 5: INVITE client transaction



Need to modify RFC 3261 for handling that response or not , please
specify your valuable comment .






ThanKs in advance 



Regards



Vijay Gupta

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20090505/307b3b19/attachment-0002.html>