[SIPForum-discussion] Regarding 180 ringing

[vijay kant gupta]

Hi Guys ,

1-3 min ringing. yaa you are right that automatic calling system will handle
that thing .
But if this service is not activate that time uas generate busy or some
temporarily unavailable.

But uac doesn't kill the call , B'coz there is no timer.

if i m wrong then please correct me.

regards
Vijay

On Wed, May 6, 2009 at 11:49 AM, Nils Ohlmeier <nils at ohlmeier.com> wrote:

> Hi,
>
> counter question: when you make a call how long do you let it ring before
> you give up? :-)
> Or to say it in other words: I think on the UAC side should be no timer. At
> some point the user will give up almost for sure. The only exception to me
> are automatic calling system. For them just choose any value which seems to
> be appropriate to you.
> And if any downstream element is not willing to let you ring the UAS side
> that long it will let you know by a final response.
>
> Best regards
>  Nils Ohlmeier
>
> Am 05.05.2009 7:48 Uhr, schrieb vijay kant gupta:
>
>> 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
>>
>>
>>
>>
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>>
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