[asterisk-users] CANCEL FORWAR

[Alex Balashov]

I think what I meant to imply there but did not say is that Asterisk 
considers this a bizarre thing for an endpoint to do as a final response 
to an INVITE (let alone one which has already been picked up with a 183) 
and understandably produces its preferred feedback to the calling leg 
for all bewildering situations -- 603.

Alex Balashov wrote:

> I would be curious to know the circumstances in which a receiving peer 
> is sending a 487 and what the justification for that would be.  A 487 is 
> usually a response code to verify receipt and execution of a CANCEL 
> transaction from the other side.
> 
> Bruno Rodrigues wrote:
> 
>> Hi All,
>>
>>  
>>
>> Have any way to asterisk forward the 487 Request Cancelled in SIP TO 
>> SIP call?
>>
>> In a SIP to SIP call when the called peer B send 487 to Asterik, 
>> Asterisk return to calling peer A  603
>>
>>  
>>
>> PEER A                    ASTERISK             PEER B
>>
>> | INVITE ------------>|                             |
>>
>> |<------------TRYING|                             |
>>
>> |                                      | INVITE------->|
>>
>> |                                      |<-------TRYING|
>>
>> |                                      |<------------183|
>>
>> |<-----------------183|                              |
>>
>> |                                      |<------------487|
>>
>> |                                      |ACK----------->|
>>
>> |<-----------------603|                              |
>>
>> |ACK---------------->|                              |
>>
>>  
>>
>>  
>>
>>  
>>
>>  
>>
>>  
>>
>>
>> ------------------------------------------------------------------------
>>
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> 
> 


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Alex Balashov
Evariste Systems
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