[Users] provisional response management ( 100 Trying )

[Weiter Leiter]

Hi,

Norman Brandinger wrote:
> At the top of our ROUTE_INVITE, we have:
>
>  #----------------------------------------------------------------------
>  # Let the UA know we are working on their request -
>  # they shouldn't send retransmissions
>  #----------------------------------------------------------------------
>  sl_send_reply("100", "Trying");
>
> This seems to work and it was adapted from code used during REGISTER
> processing.


If I got Missner's problem right, he wants to prevent sending multiple
100 replies back to the uac.

The rfc says - Page 109, paragraph 5 - that "MUST be forwarded
immediately [...] Any provisional response other than 100 (Trying)" and
later, in same paragraph that "A stateful proxy MUST NOT immediately
forward any other  [= 101<=x<=299] responses". Now, it's true that in
this case the proxy would not literally forward a 100 reply back, but
the uac would still see 2x100.

Now, if he does SL reply at the beginning, the tm module will, again,
send a 100 on his own, before relaying.

The question is how to prevent this, if I got it right...


WL.

>
> Regards,
> Norm
>
> Klaus Darilion wrote:
>> AFAI remember there was function t_relay_no_ack or similar. Take a
>> lookat the README from TM module.
>>
>> regards
>> klaus
>>
>> T.R. Missner wrote:
>>> Hello,
>>>
>>>  
>>>
>>> I want to send an immediate 100 trying message when an Invite is
>>> received, then I do a DB lookup, then I rewrite the RURI and forward
>>> the message using t_relay.
>>>
>>> Since I have already sent a 100 trying manually I’d like to short
>>> circuit the 100 t_relay sends so multiple 100 trying messages aren’t
>>> sent.
>>>
>>> Does anyone know of a way to do this?
>>>
>>>  
>>>
>>> Thanks,
>>>
>>>  
>>>
>>> T.R.
>>>
>>>  
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
>>>
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>>
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>
>
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