= SIP Presence =

[[TracNav(Python_SIP/TOC)]]


== Subscribing to Buddy's Presence Status ==

To subscribe to buddy's presence status, you need to add a buddy object, install callback to handle buddy's event, and start subscribing to buddy's presence status. The snippet below shows a sample code to achieve these.

 {{{
#!python

class MyBuddyCallback(pjsua.BuddyCallback):
    def __init__(self, buddy=None):
        pjsua.BuddyCallback.__init__(self, buddy)

    def on_state(self):
        print "Buddy", self.buddy.info().uri, "is",
        print self.buddy.info().online_text

try:
    uri = '"Alice" <sip:alice@example.com>'
    buddy = acc.add_buddy(uri, cb=MyBuddyCallback())
    buddy.subscribe()

except pjsua.Error, err:
    print 'Error adding buddy:', err
 }}}


For more information please see [http://www.pjsip.org/python/pjsua.htm#Buddy Buddy class] and [http://www.pjsip.org/python/pjsua.htm#BuddyCallback BuddyCallback class] reference documentation.


== Responding to Presence Subscription Request ==

By default, incoming presence subscription to an account will be accepted automatically. You will probably want to change this behavior, for example only to automatically accept subscription if it comes from one of the buddy in the buddy list, and for anything else prompt the user if he/she wants to accept the request.

This can be done by implementing the [http://www.pjsip.org/python/pjsua.htm#AccountCallback-on_incoming_subscribe on_incoming_subscribe()] method of the [http://www.pjsip.org/python/pjsua.htm#AccountCallback AccountCallback] class.