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What is the SIP Trunk features?

1.Only a unique, secure, QoS-guaranteed SIP Trunk link is established between the SIP Trunk device and the ITSP.
This link is used to carry multiple concurrent calls for the enterprise, and the operator only needs to authenticate the link, not each SIP call carried on the link.

2.Internal corporate communications are handled by the corporate IP-PBX.
All outbound traffic is routed to the ITSP via SIP Trunk, which in turn is sent to the PSTN network, eliminating the need to maintain traditional PSTN trunk and saving hardware and maintenance costs.

3.Enterprises can select and connect to multiple ITSPs at will by setting the destination address, making full use of ITSPs around the world and saving on call costs.


4.With the deployment of SIP Trunking devices, SIP protocols can be used across the network, allowing better support for voice, conferencing, instant messaging and other communication features

5.SIP Trunk devices are different from SIP proxy servers in that they receive a call request from a subscriber and initiate a new call request to the ITSP on behalf of the subscriber.


During the forwarding process, the SIP Trunk device not only relays the signaling messages, but also relays the RTP media messages. Throughout the process, the devices on both ends of the SIP Trunk device (internal and external to the enterprise) think that it is the SIP Trunk device itself that is interacting with them.


The SIP Trunk device is different from a SIP proxy server.

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