(Answer) (Category) SIP FAQ : (Category) SIP Functionality :
How does SIP provide message waiting services?
First, there may well be other protocols that are more appropriate to indicating that voice or email messages are available, for example POP or IMAP. In particular, once one moves beyond a simple message waiting light to indication of message counts, urgency, senders, etc., it is likely that any SIP-based solution starts replicating POP or IMAP functionality.

A SIP-based solution has not been standardized yet. Using SUBSCRIBE and NOTIFY appears to be the most appropriate approach.

[Append to This Answer]
hgs@cs.columbia.edu
2000-Jun-28 2:56pm
Previous: (Answer) Does SIP support the standard telephone features?
Next: (Answer) Why does CSeq not have a compact form?
This document is: http://www.cs.columbia.edu/~hgs/sip/faq.cgi?file=6
[Search] [Appearance]
This is a Faq-O-Matic 2.710.
This FAQ administered by Henning Schulzrinne