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Go to System->Security->SIP Trunk Security Profile.
Make yourself sure that the Device Security Mode is set to Non Secure, that the Incoming Transport Type is TCP+UDP and that the Outgoing Tranport Type is the plain UDP.
Also
Also check the Accept presence subscription option.
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Now we are ready to configure a new SIP Trunk. Go to the Cisco Unified CM Administration and from its GUI use the Device->Trunk menu entry to create a new one.
First select the Trunk Type to SIP Trunk and the Device Protocol to SIP, as in fig. X. The Trunk Service Type can be None.
After you press the Next button, you got a long page of configuration to deal with. We are going to give you the essential configuration parameter to make the trunk work with PrivateServer, so you can keep the default options configuration if not else stated.
You can choose your own Device Name and Description. Please set the Device Pool to the one containing the phones you actually want to put in contact with PrivateServer. Also check the Media Termination Point Required option. We also check the Retry Video Call as Audio for the possible Video phone (PrivateServer doesn't support video calls). Check the PSTN Access and the Run On All Active Unified CM Nodes. The rest of the options can stay in default values, till the SIP Information form (see fig. X), just pay attention to configure the Calling Search Space accordingly with your design where requested.
In the SIP Information form we need to tell the CUCMBE the IP address of our PrivateServer appliance and the Destination Port as well (the latest is 5060). Select the codec 711ulaw and the Non Secure SIP Trunk Profile which you should have created before (read above). Use also the Standard SIP Profile or just create a suitable one for your need and, most important, set the DTMF Signaling Method to the RFC28323. Once you're done, just Save it.