Connectivity Source
7780 Brier Creek Parkway Suite 225
Raleigh, NC   27617
Work 919-781-4186
Fax 866-819-7901
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Comparison of TDM solution and a SIP trunking solution.

Many IP-PBX installations look like the left side of the figure below.

This will provide a single point of failure combined with an unnecessary high load at the headquarters. The SIP trunking scenario on the right offers higher reliability (here, with the different sites independently connected to the SIP trunking provider).

In many cases a SIP trunking connection may be more reliable than the traditional TDM in itself. It offers more backup alternatives including the ones described in the following sections.