[SIPForum-discussion] Regarding 180 ringing
Nils Ohlmeier
nils at ohlmeier.com
Wed May 6 06:19:09 UTC 2009
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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