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There is some pre-requisite to be filled in before we even start configuring. The most important one is the network connection, but we also got to take care of design, deciding either the number plan and the possible dial prefix.

2.1 Network

It can sound awful or just pedantic, but it's necessary that both the devices (ie PrivateServer and the other one) can "see" each other, and not just in matters of ICMP Pings, but actually via UDP connection. This because the UDP connection will be the transport mean for the SIP Trunk. Thus please check out the UDP communication is possible on the network legs between the two devices. We suggest to let the whole UDP port range open.

2.1 Number Plan

Also this pre-requisite is often disattended or considered of less importance. This attitude is wrong, because without a clear and stated number plan we can really risk number overlapping which would lead to unexpected call routings and very nasty to debug issues. So please before you start just write down the telephone numbers you are providing to the PrivateServer device to be called and consider the impact of calling secure numbers on your own PBX.

2.2 Dial Prefix

3. Specification

dfhTo let either PrivateServer and the other device correctly route the calls to each other, we need to decide whether to setup a dial prefix or not. Consider that the behaviour for PrivateServer is to search in its own database for the number dialed. If the number is not present AND a SIP Trunk is on, then PrivateServer will route the call throught the SIP TRUNK, expecting that on the opposite side the other device would know how to deal with it. So if you mean to route specific numbers (let's say actual phone numbers) from a secure leg to your PBX and throught the PrivateServer, you better consider to add a routing dial prefix to make them acknowledged.  

3. Specification

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

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3.2 Registration/non registration

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3.3 Codecs

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4. Conclusions