Voice over IP (VoIP) network infrastructure components and method

A computer-readable storage device having program instructions stored thereon that, upon execution by a processor of a session border controller, cause the session border controller to:

• receive a registration indicating an endpoint is utilizing a first network layer address;
• process a Voice over Internet Protocol (VoIP) call on behalf of the endpoint wherein the VoIP call is processed using a call peer that is bound to the first network layer address;
• apply a first topology hiding policy to the VoIP call;
• receive an updated registration indicating the endpoint is utilizing a second network layer address;
• bind the call peer to the second network layer address;
• and
• apply a second topology hiding policy to the VoIP call.

A Border Session Controller, comprising:

• a processor;
• and
• a memory coupled to the processor, the memory having program instructions stored thereon that, upon execution by the processor, cause the Border Session Controller to:
• receive a registration indicating an endpoint is utilizing a first network layer address;
• process a Voice over Internet Protocol (VoIP) call on behalf of the endpoint, wherein the VoIP call is processed using a call peer that is bound to the first network layer address;
• apply a first topology hiding policy to the VoIP call;
• receive an updated registration indicating the endpoint is utilizing a second network layer address;
• binding the call peer to the second network layer address;
• and
• applying a second topology hiding policy to the VoIP.