[asterisk-dev] SIP_HEADER in dialplan from different states of SIP dialog?

[Alex Balashov]

Alex Balashov wrote:
> Greetings,
> 
> I've got a problem I was hoping someone from the developers' community 
> could help me with.
> 
> I'm running outbound calls using a B2BUA product for call progress 
> detection that sets the disposition of the call in the 200 OK sent back 
> to Asterisk in response to its INVITE.
> 
> Is there some way I can get at this value either in the dial plan, or in 
> AGI?
> 
> Of course, I realise that deep inspection of particular states of the 
> SIP dialog aren't really meant to be possible from within something as 
> high-level as the dial plan.  However, what I assumed was that if I punt 
> the execution to a macro when the call is picked up using the M argument 
> to Dial(), e.g.
> 
>     exten => ...,n,Dial(SIP/num at GW,M(outbound_macro))
> 
> Then, because, in practise that macro is called on pickup (i.e. 200 OK), 
> I would have assumed that the message from which SIP_HEADER() is parsing 
> the headers is the 200 OK.
> 
> But it's not.  My tests show it's still looking at the headers in the 
> initial outgoing INVITE.
> 
> So, the question is - without hacking the code, is there some way I can 
> read the value of a header that is returned in a 200 OK in an INVITE dialog?
> 
> Cheers,
> 
> -- Alex
> 

BTW, I read this:

http://bugs.digium.com/view.php?id=4934

But, I wasn't sure what constitutes getting a message "from an INVITE." 
  From a request whose method is itself INVITE, or one that is part of 
an INVITE dialog?

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