[Asterisk-Dev] How the Alert-Info mod works

[Peter Grace]

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OK, here's the skinny on how the patch works:

The Alert-Info: header is set in module chan_sip, to
whatever contents there are in variable ALERT_INFO.  An
example of how 
to use this on cisco 7960/ata-186s would be:

exten => 1002,1,SetVar(ALERT_INFO=3)
exten => 1002,2,Dial,SIP/pete|Ttr
exten => 1002,3,Voicemail(u1002)

In this case, the SetVar will cause ALERT_INFO to have 3 in
it's data 
portion..  When the Dial commences, chan_sip sees the
ALERT_INFO 
variable and pipes "3" into the Alert-Info: header on the
INVITE sent 
to the SIP phone.

Now, if we were following the RFC, it'd be more like:

exten =>
1002,1,SetVar(ALERT_INFO=http://www/christina_aguilera=dirty
.wav)
exten => 1002,2,Dial,SIP/pete|Ttr
exten => 1002,3,Voicemail(u1002)

Which would cause Christina's FINEST WORK (har har) to pour
out of the 
SIP phone's speaker.



Any questions?



Pete

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