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2.1 Backgrounds about SIP Trunks

The SIP Trunks are used for connecting PrivateServer to a local PBX or to a SIP Voice provider. The above statement implies that a Trunk can be used both for receiving and placing calls in a bidirectional way.

By Secure Call design the SIP Trunks are available only for the PrivateGSM Enterprise Edition. PrivateGSM Professional Edition can't place calls on a Trunk.

The PrivateServer is designed to perform always as a client when configuring a SIP Trunk. This means that PrivateServer itself can not act as a Trunk Provider.

Even if each SIP Trunk can be used to both receive and place calls, PrivateServer has to be properly configured in order to act in a bidirectional way. By default the Inbound Trunks are configured for enabling the calls directed to external number through a different PBX. They can be later set up to let the PrivateServer receive incoming calls from a different PBX. This setup is made promoting one Inbound Trunk as an Outbound one.

Basically the Trunk setup has to be done for the outgoing calls first and after this function is enabled you can setup it for incoming calls as well.

From the PrivateServer version 2.5 you have two main SIP Trunk Families:

  1. Secure Trunks
  2. Unsecure Trunks

The former ones entail both TLS and SRTP, while the latter none of them: they use just RTP over UDP (thus without TLS).

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