[Asterisk-Dev] Distinctive ringing on Cisco 79xx - useful feature
jtodd at loligo.com
Tue Jun 3 20:11:03 MST 2003
I've run across the "feature request" for distinctive ringing in
three different locations/bids now, where Asterisk is being compared
to "traditional telephony" using SIP. Thus far, I haven't been able
to answer "Yes" but it looks like with only a minor hack, I could
check off that box. It's not a show-stopper, but it certainly would
Interesting feature on the Cisco 79xx phones that you can activate
distinctive ringing with an additional SIP header. It would be
really useful to permit this as a set-able variable in a dialplan, so
that different inbound callers might activate different ringtones, or
the same ringtone in a quieter format based on time of day.
From the SIP Administrator's Guide:
If the INVITE message contains an Alert-Info header, distinctive
ringing is invoked. The format of
the header is "Alert-info: x". The value of "x" can be any number.
This header is received only by
the phone and is not generated by the phone.
Distinctive ringing is supported when the phone is idle or during a
call. In the idle mode, the phone rings with a different cadence. The
selected ringing type plays twice with a short pause in between. In
call-waiting mode, two short beeps are generated instead of one long
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