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Re: [Sipping] Missed calls event package



Jeroen van Bemmel wrote: 
Hi Dean, Arif,

Thank you for your pointers, indeed I think that RFC3842 could solve my problem

Well, it might help with reporting about missed calls. It doesn't help with capturing the record of missed calls so that it may be reported.

I do feel people could benefit from having a standards based solution, I also did find some products that support similar features (although more often client side than server side, i.e. a different feature). 

My (non-sip) phone displays lists of missed, received, and placed calls.

I can see MWI being extended to support missed calls - I see little difference from a zero length voicemail message.

But I find it harder to see it being extended to support the others.

One issue that I think would still need to be standardized is the manner in which a UA would recognise a message as representing a missed call.

Well, that is the rub isn't it. For the typical kind of sip system, where there is a proxy responsible for an AOR, and one or more UAs registered for that AOR, there is no guarantee that a UA will even see all the calls that are missed. The proxy may have been set to Do Not Disturb mode and refuse them without offering to a UA, or the call may be serial forked and one UA may return a 6xx response, preventing the call from being offered to the others, etc.

Even for the proxy there need to be some definitions. Sometimes (e.g. voicemail) if the call is picked up by an automaton then it was missed. But in the case of an IVR that is not so.

You could of course simply scan for all 'From' headers you can find, but 

Scan *what*?

This could be an area for new work, starting with trying to define the requirements. You would have to see if there is sufficient interest to pursue it at this time.

	Paul

they may not all represent headers from a previous INVITE (could also be e.g. MESSAGE, or a received SMS). To me none of the message context values from RFC3458 can accurately represent this (see http://www.faqs.org/rfcs/rfc3458.html)

Perhaps something like:
Message-Context : sip-inviteRegards,
jeroen


----- Original Message ----- From: "Dean Willis" <dean.willis at softarmor.com>
To: "Jeroen van Bemmel" <jbemmel at zonnet.nl>
Cc: <Sipping at ietf.org>
Sent: Monday, June 27, 2005 11:52 PM
Subject: Re: [Sipping] Missed calls event package



On Jun 24, 2005, at 3:52 PM, Jeroen van Bemmel wrote:

Hi,

Is there an event package defined for notification / retrieval of missed calls (in particular the ones that occur when you have no SIP UA online, which requires network support)


I'm not aware of a standard event package here. There is a product listing such a feature at:

http://www.dynamicsoft.com/prod_sol/MissedCallSummary/ missedcallsummary.php

But I think it might be feasible to use Message Waiting Indicator, RFC 3842, to do something similar.

--
Dean



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_______________________________________________
Sipping mailing list  https://www1.ietf.org/mailman/listinfo/sipping
This list is for NEW development of the application of SIP
Use sip-implementors at cs.columbia.edu for questions on current sip
Use sip at ietf.org for new developments of core SIP