OCS is meant as a value adding service platform that offers Unified communications by integrating IPTelephony, presence, instant messaging and e-mail. The power lies in the connections. A powerfull connection, and also a...
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OCS is meant as a value adding service platform that offers Unified communications by integrating IPTelephony, presence, instant messaging and e-mail. The power lies in the connections. A powerfull connection, and also a difficult, is to connect it to a PABX. In this case, the PABX is based on Asterisk. Asterisk takes care of the connectivity with the PSTN and the number plan. OpenSER acts as a proxy between Asterisk and OCS, since OCS only supports SIP over TCP and Asterisk only SIP over UDP. When a call is made, the message flow is as follows: SIP: Communicator 2007 <-TLS--> OCS <-TLS--> OCS med serv <- TCP -> OpenSER <- UDP -> Asterisk <-> PSTN Media: Communicator 2007 <-SRTP-> OCS <-SRTP-> OCS med serv <------------RTP----------> Asterisk <-> PSTN This recipe needs one bug to be resolved concerning RTP flowing from Asterisk to the Mediation server. Solution coming soon.
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