Integration of asterisk with Office communication server

can any body plz assist me on integrating of OCS with Asterisk.
as my main aim was to

sip phone->asterisk->OCS->oc

so i want to make a call from sip phone which is connected to asterisk server to oc (office communicator) which is inturn connected to OCS.

 But the main problem is as asterisk runs over UDP and OCS runs over TCP ?

can ony1provide me a detail steps for the above problem

You will need a program of some sort to do the translation between UDP and TCP. I believe the SIP Express Router, at, will be able to do this for you.

Also check out Paraxip’s gateway solution at

Hope that helps,