Hello, On 6/7/12 11:55 PM, Min Wang wrote: msrp module is an implementation of a msrp relay, see RFC4975 and RFC4976. I am not using the other software you mention, so have no clue what it does. MSRP module is targeting usage with Kamailio as SIP server, but can be used as a msrp relay for other sip applications -- although never tried, should be no problem. Together with the presence module and other instant messaging extensions, you can build a rich communication system (RCS/RCSe) just by using Kamailio only. Cheers, Daniel -- Daniel-Constantin Mierla -http://www.asipto.com http://twitter.com/#!/miconda -http://www.linkedin.com/in/miconda Kamailio Advanced Training, Seattle, USA, Sep 23-26, 2012 -http://asipto.com/u/katu Kamailio Practical Workshop, Netherlands, Sep 10-12, 2012 -http://asipto.com/u/kpw