Feb 3, 2009

Tail-End Hop-Off (TEHO)

Tail-End Hop-Off (TEHO) allows a company to reduce its long-distance toll charges. When remotes sites are connected by an IP WAN, you can route calls that are bound to those cities—and those sites—over the WAN. The terminating gateway then routes them out to the PSTN as a local call. This sounds like a good idea in theory, but it can be complex in practice.

You need a separate dial peer for each area code/prefix combination in each remote location. Large cities have many prefixes and might have several area codes also. Small cities or regions might have some prefixes within the same area code that are local calls, and some that are long-distance calls. You might need a gatekeeper for an extensive TEHO implementation.

Regulatory issues might curtail the use of TEHO, also. TEHO results in a loss of revenue for telecommunications companies, so some countries regulate calls carried across country or regional borders. Careful planning and research on the most recent laws concerning mixed VoIP and PSTN calls is necessary before implementing TEHO in your network.
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