2009/10/7 Juha Heinanen jh@tutpro.com:
yes and one pragmatic solution might be to add a xmmp server to the infrastructure so that user can use the same uri both as a sip uri and xmmp uri depending on client's capabilities.
noooooo!!!
SIP & XMPP integration is a hack!! It's just a dirty workaround, nothing else. It requires management and maintenance of two different protocols, two different QoS, two authentication mechanims... what about dialog subscriptions for call pickup and so? dialgo presence with SIP and user presence with XMPP? oh nooo please....
Yes, it's true that until now the only feasible IM and presence solution is XMPP, but we are in SIP side! and we must extend the usage of SIP for IM and presence (even if implementations are not mature yet...). We must help in the adoption of SIMPLE/XCAP under feasible specs (OMA?). If we insist on using XMPP then we are not helping at all :(