Hi all,
I am using Kamailio 4.3 as Presence server and I have a question regarding NOTIFY messages sent after publication status refresh. When PUA sends refreshing PUBLISH request (before expiration) Kamailio sends NOTIFY request. Large number of watchers per one presentity causes large traffic.
RFC3265 states: NOTIFY messages are sent to inform subscribers of changes in state to which the subscriber has a subscription.
But when publication is only refreshed (publication expiration is extended) the publish state is not changed (PUBLISH without XML body).
From RFC5839: The SIP PUBLISH [RFC3903] method uses a similar mechanism,
where a refresh of a publication is done by reference to its assigned entity-tag, instead of retransmitting the event state each time the publication expiration is extended.
Is it possible to configure Kamailio that wouldn't send NOTIFY request to watchers when publication status refresh (PUBLISH without XML Body) occur?
Can anyone help?
Thanks in advance,
Ales