John,
I am with Ben, it is morning in my hemisphere and I to am lacking
coffee - but what good is including an Alert-info header in the 180
Ringing ?, unless I have missed something I know of it only as a way to
inform the end device to play a distinctive ring - sending it back in the
reverse direction is accomplishing what ?. The 'mapping' of this I have
seen is play distinctive rings for each line of a multiline phone - to
give audible representation of which line (dn) is being alerted, although
whatever is sending the INVITE to the end device can do whatever logic to
insert | change this field (I have heard of the concept of alerting with a
different tone based on the incoming call being a fax - but the logic to
do this is boggling).
I believe the number setting you may have seen could have been for
Cisco phones distinctive ring - I understand / recall that they have a
numeric number which correlates to different tones on the phone - it only
supports 4 or something, I believe I remember having to re-use tones on a
7960 6 line phone.
The URL form of doing it is much more flexible - you can point it
at standard known Bellcore tones - some of which will be included in phone
firmware which lest you use the 127.0.0.1 loopback IP address as given in
troys example below, so no security risk there. But if the device is
trusting - no problem in pointing it somewhere else and getting Muppets
theme or something as ring tone as well.
Regards,
Wayne Davies
"Wainwright, John" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
19/11/2004 05:45 AM
To: "'Troy Cauble'" <[EMAIL PROTECTED]>,
[EMAIL PROTECTED]
cc:
Subject: RE: [Sip-implementors] Distinctive Call ringing.
This could be the case - I will investigate further.
I think I am only really interested in the Alert-info as part of the 180
Ringing message - I don't think my application will generate it in an
INVITE
method.
Aren't there security concerns with supplying a URL from a Calling party
to
be played by a Called party ?
I always thought DCR was more useful when linked to a caller ID such that
a
different 'tone' was played depending on the calling party ?
Thanks
John
-----Original Message-----
From: Troy Cauble [mailto:[EMAIL PROTECTED]
Sent: Thursday, November 18, 2004 1:25 PM
To: [EMAIL PROTECTED]; Wainwright, John
Subject: Re: [Sip-implementors] Distinctive Call ringing.
"Wainwright, John" <[EMAIL PROTECTED]> wrote:
> Does anyone have any experience with Distinctive Call Ringing using
> SIP ?
>
> As far as I can make out this is achieved using the ALERT-Info header
> which seems to take a URL as a parameter to indicate what ringing
> 'tone' to play. I thought I came across a Cisco implementation that
> used an integer field instead of the URL.
>
> Any insights ?
>
> Thanks
> John
Alert-Info: and the use of an URL are standard.
I've seen more than one system use this form
Alert-Info: <http://127.0.0.1/Bellcore-dr3>
to indicate a DR, but I don't think it's a standard.
(Google will turn up some examples.)
Just guessing, but maybe the implementation you remember
took a integer field at configuration time, then generated something like
the above from it.
-troy
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