30 Dec
2006
30 Dec
'06
1:37 p.m.
On Dec 29, 2006, at 11:47 PM, Klaus Darilion wrote:
Hi!
I read the docs of the presence module and have some question. Maybe
someone can enlighten me ;-)
1. If I understand correctly, the pua module acts as a "UAC". Thus,
it can
be used to send PUBLISH or SUBSCRIBE. I wonder what is the usecase for
sending SUBSCRIBE? Usually, a client which sends a SUBSCRIBE receives
subsequent NOTIFY messages. How can these NOTIFY messages be handled?
In this case is the pua module that sends Notify as responses to the
Subscribe messages sent by the SIP UAs. For this to work the SIP UA
must be set to use presence using a Presence agent where it send
Publish messages and the proxy must relay all Subscribe messages to
the presence module. The SIP UA does not send Notify in this case.
1. Presence Peer to Peer mode
SIP UAs send Subscribe/Notify between themselves. The Proxy need only
to route these messages.
2. Presence Server mode
SIP UAs send Publish/Subscribe and both get routed to the presence
server, which then sends Notify to the watchers validated by the XCAP
rules. The proxy configuration must route the Subscribe messages to
the presence server or module.
As far as I understand, these two modes seem to exclude each other,
once you enable either mode the other cannot work so all user agents
must obey to this topology.
Adrian