[VoIP] Early audio aka non-sup call progress info

[john jones]

John,

Can you use this technique to receive CID from
multiple lines without answering and then pass the CID
out to another extension?

I have a large display, single-line CID device.  I'd
like to pass the incoming CID from PSTN, Vonage, CNET
etc.

I don't yet have much experience with the call
handling capabilities of Asterisk.

Thanks!

John


--- "John R. Covert"
<john_reads_cnet_via_archives at covert.org> wrote:

> A little-known feature of Asterisk allows you to
> send early audio
> on DID trunks delivered to you via those mechanisms
> where the
> carrier allows you to do so.  This will usually be
> the case on
> DID trunks delivered via E&M or T1 as well as by SIP
> and IAX.
> It will never be the case for a standard C.O. trunk
> terminating
> on a loop-start FXO port.
> 
> CAUTION: Providing useful information (other than
> call progress)
> without first going off-hook is toll fraud, and if
> Asterisk users
> start doing it when they shouldn't, then providers
> are going to
> refuse to allow the audio to be passed back.
> 
> In general, early audio can only be sent from the
> called switch
> back to the caller, not in the forward direction. 
> This is not
> always the case, but you should plan for it being
> the case.
> 
> Before explaining how to do it in Asterisk, here are
> a couple
> of examples of what to do and not to do.
> 
> It's legit to provide a ring tone, busy tone,
> strange call
> progress tone, vacant number recording, referral to
> the main
> number on vacant extension, or similar response
> using early audio.
> 
> It's not legit to provide interesting historical
> recordings, access
> to voicemail, or messages like "John is out of the
> office and will
> return at 7:45 tomorrow morning."
> 
> Here's an example, which you can hear on CNET 1
> 263-5999
> exten => s,1,Progress()
> exten => s,n,Playtones(ring)
> exten => s,n,Wait(2)
> exten => s,n,Playback(holdline,noanswer)
> exten => s,n,Playtones(440/45,0/45)
> exten => s,n,Wait(1.4)
> exten => s,n,StopPlaytones
> exten => s,n,Playtones(442/47,0/47)
> exten => s,n,Wait(1.4)
> exten => s,n,StopPlaytones
> exten =>
> s,n,Playtones(413+438/400,0/200,413+438/400,0/2000)
> exten => s,n,Answer()
> exten => s,n,Playback(linux&lyrics-louie-louie)
> exten => s,n,Hangup
> 
> /john
> 
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