System for ad-hoc communication sessions

A network device, comprising:

• a storage device, configured to:
• store a list of approved service phone numbers, wherein the approved service phone numbers provide access to a secured network for a user device regardless of whether the user device has been authenticated on the secured network;
• and
• store a table of authenticated user devices authenticated on the secured network;
• and
• a controller communicatively coupled to the storage device, configured to:
• receiving a session internet protocol (SIP) invite message, wherein the SIP invite message includes data indicative of the user device and data indicative of a service phone number;
• comparing the data indicative of the user device to the table of authenticated user devices to determine whether the user device is represented in the table of authenticated user devices;
• forwarding the SIP invite message to the service phone number, if the user device is represented in the table of authenticated user devices;
• comparing the list of approved service phone numbers to the data indicative of the service phone number to determine whether the service phone number is represented in the list of approved service phone numbers, if the user device is not represented in the table of authenticated user devices;
• and
• forwarding the SIP invite message to the service phone number, if the service phone number is represented in the list of approved service phone numbers.

A non-transitory computer readable medium encoded with computer executable instructions executable to:

• store a list of approved destination endpoints, wherein the approved destination endpoints provide access to a secured network for a source endpoint regardless of whether the source endpoint has been authenticated on the secured network;
• store a table of authenticated source endpoints authenticated on the secured network;
• receive a session internet protocol (SIP) invite message at a network device of the secured network, wherein the SIP invite message includes data indicative of the source endpoint and data indicative of a destination endpoint;
• compare the data indicative of the source endpoint to the table of authenticated source endpoints to determine whether the source endpoint is represented in the table of authenticated source endpoints;
• forward the SIP invite message to the destination endpoint, if the source endpoint is represented in the table of authenticated source endpoints;
• compare the list of approved destination endpoints to the data indicative of the destination endpoint to determine whether the destination endpoint is represented in the list of approved destination endpoints, if the source endpoint is not represented in the table of authenticated source endpoints;
• and
• forward the SIP invite message to the destination endpoint, if the destination endpoint is represented in the list of approved destination endpoints.