SIP Trunking with an IP-PBX

For new offices where infrastructure is just being setup this might be the perfect way to go. The scenario
involves providing a SIP trunk for IP devices that are already SIP enabled. These devices could typically
interact with the trunk directly. However, to provide cer- tain advanced features—such as call admission con-trol, billing, QoS, security, and others—intermediate devices must be deployed. These may include an IP PBX and a session border controller.

Advantages:
a. Advanced features like call parking, voice enabled IVR, integration with other business subsystems can be enabled
b. The cost of maintaining an IP PBX is much less than that of maintaining legacy PBXs
Disadvantages
a. Must invest in completely new hardware
b. End users must go through a learning process to master the newer features

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