Call authorization and verification via a service provider code

An apparatus comprising:

• a receiver of a call termination service provider configured to receive a call message associated with a call;
• a processor configured to
• retrieve a first table comprising calling party assigned telephone numbers and corresponding service provider network identifiers;
• retrieve a second table comprising the service provider network identifiers and corresponding service provider codes;
• identify, via the first table, a service provider network identifier assigned to the calling number of the call origination device;
• identify, via the second table, the service provider network identifier has an entry that matches a service provider code;
• determine the service provider network identifier identifies a service provider network that supports the call origination device, based on the calling number of a call origination device;
• identify, from the call message, an identity header comprising a link to a public certificate repository storing a public certificate assigned to the service provider network;
• retrieve, via the call termination service provider, the service provider code from the public certificate assigned to the service provider network;
• determine, via the call termination service provider, whether the service provider code matches the service provider network identifier as identified from the second table accessed by a verification service of the call termination service provider;
• and
• block or verify the call based on the match determination.

A non-transitory computer readable storage medium configured to store instructions that when executed cause a processor to perform:

• receiving a call message associated with a call at a call termination service provider;
• retrieving a first table comprising calling party assigned telephone numbers and corresponding service provider network identifiers;
• retrieving a second table comprising the service provider network identifiers and corresponding service provider codes;
• identifying, via the first table, a service provider network identifier assigned to the calling number of the call origination device;
• identifying, via the second table, the service provider network identifier has an entry that matches a service provider code;
• determining the service provider network identifier identifies a service provider network supporting the call origination device, based on the calling number of the call origination device;
• identifying, from the call message, an identity header comprising a link to a public certificate repository storing a public certificate assigned to the service provider network;
• retrieving, via the call termination service provider, the service provider code from the public certificate assigned to the service provider network;
• determining, via the call termination service provider, whether the service provider code matches the service provider network identifier as identified from the second table accessed by a verification service of the call termination service provider;
• and
• blocking or verifying the call based on the match determination.