[asterisk-users] CANCEL FORWAR

[Alex Balashov]

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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> 
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-- 
Alex Balashov
Evariste Systems
Web    : http://www.evaristesys.com/
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