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1. Are your other contacts all using Communicator?
2. Does your OCMS server have the presence application installed?
3. Are your XDMS settings in your Oracle Communicator correctly set to your OCMS instance and HTTP port (typically 8888)?
As far as SIP underneath, when the Communicator needs to send presence information to other clients, it issues a PUBLISH message. When interested in presence information of other clients, it issues a SUBSCRIBE message. When receiving presence information from other clients, it receives a NOTIFY message.
For some background reading on SIP, I recommend RFC 3261 and RFC 3265.
The thing is that I´m using the sip-communicator client, a open source client, and as far as I can tell is exchanging the correct messages with the server but other users that are connected using Communicator, can´t see is Online but can call him. Other thing that I find odd is that I can send messages from the sip-communicator to others that are using the Communicator but can´t do the other way around... Do you know what is the problem?
The Presence server is installed and XDMS settings are correct.
This may be because the registration info from the sip-communicator client doesn't indicate that it can handle MESSAGE, thus our Proxy will not forward messages that the client can't handle.
Can you give us a SIP-level trace of the REGISTER sequence from the sip-communicator?