Anti-spoofing techniques for outbound telephone calls

A system configured to verify a caller ID field of an outbound telephone call, comprising:

• a termination service provider call server, comprising one or more processors configured to execute instructions to:
• receive a call request from a calling endpoint, the call request created by the calling endpoint and including a called endpoint telephone number, and a caller ID telephone number;
• forward the call request to an inbound carrier call server servicing the called endpoint telephone number;
• an inbound carrier call server, comprising one or more processors configured to execute instructions to:
• receive the call request intended for the called endpoint telephone number;
• determine the termination service provider for the caller ID telephone number;
• send a query back to the determined termination service provider to determine whether the caller ID telephone number is currently in use, the query including the caller ID telephone number;
• the termination service provider call server, further comprising one or more processors configured to execute instructions to:
• receive the query from the inbound carrier call server;
• determine whether the caller ID telephone number in the received query is currently in use;
• if the caller ID telephone number is not currently in use, return a fail message to the inbound carrier call server in response to the query;
• if the caller ID telephone number is currently in use, return a pass message to the inbound carrier call server in response to the query;
• the inbound carrier call server, further comprising one or more processors configured to execute instructions to:
• not route the call request to the called endpoint if the query response received from the termination service provider is a fail message;
• and
• route the call request to the called endpoint if the query response received from the termination service provider is a pass message.

A non-transitory computer-readable medium comprising a plurality of instructions that when executed enable processing circuitry to execute instructions to verify a caller ID field of an outbound telephone call, the instructions to:

• in a termination service provider call server:
• receive a call request from a calling endpoint, the call request created by the calling endpoint and including a called endpoint telephone number, and a caller ID telephone number;
• forward the call request to an inbound carrier call server servicing the called endpoint telephone number;
• in the inbound carrier call server:
• receive the call request intended for the called endpoint telephone number;
• determine the termination service provider for the caller ID telephone number;
• send a query back to the determined termination service provider to determine whether the caller ID telephone number is currently in use, the query including the caller ID telephone number;
• in the termination service provider call server:
• receive the query from the inbound carrier call server;
• determine whether the caller ID telephone number in the received query is currently in use;
• if the caller ID telephone number is not currently in use, return a fail message to the inbound carrier call server in response to the query;
• if the caller ID telephone number is currently in use, return a pass message to the inbound carrier call server in response to the query;
• in the inbound carrier call server:
• not route the call request to the called endpoint if the query response received from the termination service provider is a fail message;
• and
• route the call request to the called endpoint if the query response received from the termination service provider is a pass message.