Patent ID: 7945275

Claim:
A method comprising: passing an invite message from a first party to a second party in a communication system; passing a response to the invite message from the second party to the first party, the response including at least one parameter in breach of a policy for a communication between the first party and the second party; detecting in a network controller that the response includes the at least one parameter in breach of the policy; modifying, by the network controller, the at least one parameter to be consistent with the policy; sending, by the network controller to the first party, an okay message comprising a session description protocol offer including the modified at least one parameter; receiving a provisional response acknowledgement comprising a session description protocol answer including the modified at least one parameter, when the modified at least one parameter is accepted by the first party; and receiving another invite message, when the modified at least one parameter is not accepted by the first party, wherein the another invite message includes at least one parameter modified by the first party, wherein the network controller comprises a proxy call state control function.