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

[Peter Grace]

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Interesting idea.  You'd have to have phones that supported
the distinctive ring of the RFC type..  So far, we've
(jtodd, myself) only heard of cisco implementing
Alert-info, and even then it's not up to par with the RFC. 
If the phone downloaded the ring every time it had to ring,
then maybe it'd work.  However, for all we know it may
download the ringtones to the phone and then cache it?

Many unknowns, because we could only test it on a 7960.  If
anyone else happens to know if their sip phone supports
Alert-Info, it'd be an interesting experiment!

Pete


- -----Original Message-----
From: Alex Lopez [mailto:alex at opsys.com] 
Sent: Thursday, June 19, 2003 12:35 AM
To: asterisk-dev at lists.digium.com
Cc: pgrace at fierymoon.com
Subject: RE: [Asterisk-Dev] How the Alert-Info mod works


Off Topic, but could This be used to play a wav,gsm,audio
file out of the speaker, for use in paging. 

For example:
PAGEGROUP777=SIP/pete&SIP/peter&SIP/petty


exten => 777,1,Record(pagefile)
exten =>
777,2,SetVar(ALERT_INFO=http://asterisk-server/pages/pagefil
e.gsm)
exten => 777,3,Dial,({$PAGEGROUP777})
exten => 777,4,AGI(removefile|pagefile.gsm)
exten => 777,5,Hangup



- -----Original Message-----
From: Peter Grace 
Sent: Wednesday, June 18, 2003 8:01 PM
To: asterisk-dev at lists.digium.com
Subject: [Asterisk-Dev] How the Alert-Info mod works


 
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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,
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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