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Configuring SIP trunk
As shown in Figure 693, on a typical telephone network, internal calls of the enterprise are made
through the internal PBX, and external calls are placed over a PSTN trunk.
Figure 693 Typical telephone network
With the development of IP technology, many enterprises deploy SIP-based IP-PBX networks as
shown in Figure 694. Internal calls of the
enterp
rise are made by using the SIP protocol, and external
calls are still placed over a PSTN trunk. The problem is that the enterprises have to maintain both the
SIP network and PSTN trunk. This increases the difficulty of network management.
Figure 694 SIP+PSTN network
As more enterprise IP-PBX networks run SIP and more Internet Telephone Service Providers (ITSPs)
use SIP to provide basic voice communication structures, enterprises need a technology that uses
SIP to connect the enterprise IP-PBX network to the ITSP. This is necessary to have network that is
entirely IP-based. This technology is called SIP trunk. A typical SIP trunk network is shown in Figure
69
5.
The SIP
trunk function can be embedded into the voice gateway or the firewall deployed at the edge
of an enterprise private network. The device providing the SIP trunk function is called the SIP trunk
device, or the SIP trunk gateway.
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