Polycom MGC Administrator Administrator's Manual page 419

MGC Administrator's Guide
Figure 7-7: Call Flow Using Forwarding Service
In this method, only a few dial-in numbers (as little as one) may be used to
access the gateway. One dial-in number may serve many H.323 endpoints. It
does not require any additional configuration of the endpoints or the gateway.
However, this method can only be used with H.320 endpoints that support
TCS4. To use the endpoint's alias, a gatekeeper must be present in the
network and the H.323 endpoints must register with the gatekeeper using
their numeric aliases (E.164 format).
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