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After you're done with pre-requisites, then you can start configuring the devices. These are the protocol specifications you need to be implemented and set up to make the devices talk each other.
3.1 SIP protocol support
sdlfnThe SIP Trunk would work on... SIP protocol. So it's mandatory that such protocol is supported by the PBX/device to which PrivateServer is connecting.
3.2 Registration/non registration
sdglkdsgIt doesn't matter if the device supports the registration or doesn't, as PrivateServer can be configured in either ways, but this is a feature to be noted in order to correctly configure the trunk on PrivateServer
3.3 Codecs
lwekglksdgnThe device must support the alaw/ulaw audio codec in order to be able to connect to PrivateServer.