[Asterisk-Users] Distinctive Ring Cadences

[Chris Shaw]

----- Original Message -----
From: "Mike Meyer" <mjmeyer at gendesign.com>
To: "Asterisk Users Group" <asterisk-users at lists.digium.com>
Sent: Wednesday, August 25, 2004 2:41 PM
Subject: [Asterisk-Users] Distinctive Ring Cadences


> Hello All,
>
> I am looking for a way to do priority call ringing. That is when a
> caller places a call to another party, they can indicate that the call
> is a priority and get a different ring to occur (ring cadence) on the
> called parties phone. This would be synonymous to an intercom ring on a
> key system.
>
> After some investigation, I have come across the ability of the GS
> BT101 which will ring differently based on the CID. But, this doesn't
> allow the caller to control the ring.
>
> I have uncovered some past discussions
>
(http://lists.digium.com/pipermail/asterisk-users/2002-December/006378.html)
and (http://lists.digium.com/pipermail/asterisk-dev/2003-June/000916.html )
regarding patches to support SIP phones and have no idea if they are
implemented features or not.
>
> If anyone knows, please let me know.

Mike,

I am in no way a SIP expert so please take my comments with a grain of salt,
but this would require something attached to the INVITE message sent to the
phone. I know that * (with a little patching) can transmit intercom=yes to a
SNOM phone indicating that the incoming session wants to use the intercom
function... If phones have something similar to this like ringcadence=3 then
it could be passed on... I would imagine that the value you pass to the
phone is specific to the make and model of phone however... Not all phones
would use ringcadence= and not all models would support '3' for example...

There has been some discussion of this in the bug lists and here on list,
but I'm not sure as to the status of this yet in *... I know for the Cisco
phones, there is a variable called ALERT_INFO you can set to change the ring
cadence but that's the only phone I know of so far...

It would be soooo cool if Digium made their own brand of phones, or at least
commissioned someone like Sayson to do it for them... then we could get a
completely *-compatible solution with all of the bells and whistles we
want... If we want to go with our own phones, then we would have to
sacrifice the fancy features but at least it would still work! Maybe they
already have something like this in mind? I would be totally behind it!
Especially if it spoke IAX! :)

    -Chris