Method for determining a set of encoding formats in order to establish a communication

An application server of a communication network, the application server comprising at least one processor and at least one memory, the at least one processor configured to:

• receive from a server of user profiles of the communication network a notification message relating to restrictions of use of codecs on the communication network, permitted coding formats on the communication network at a moment of notification being included in the notification message as a first set of coding formats permitted on the communication network, each coding format of the first set being associated with a type of access network and with a type of communication service, said notification message being received subsequent to a subscription of said application server for being notified of restrictions of use of codecs on the communication network;
• obtain, in a received message originating from a first terminal registering or being registered to the communication network by way of an access network, a second set of coding formats supported by a first terminal, a type of access network, and a type of communication service which are used by the first terminal;
• determine a third set of coding formats, the third set comprising the coding formats of the first set corresponding to coding formats of the second set and associated with the type of access network and the type of communication service used by the first terminal;
• in response to the third set of coding formats being empty, unregister the first terminal;
• and
• in response to the third set of coding formats being not empty, use solely coding formats of the third set for negotiating establishment of communications of the first terminal via the communication network by way of the access network.

A non-transitory computer readable medium having stored thereon instructions which, when executed by a processor of an application server of a communication network, cause the processor to:

• receive from a server of user profiles of the communication network a notification message relating to restrictions of use of codecs on the communication network, permitted coding formats on the communication network at a moment of notification being included in the notification message as a first set of coding formats permitted on the communication network, each coding format of the first set being associated with a type of access network and with a type of communication service, said notification message being received subsequent to a subscription of said application server for being notified of restrictions of use of codecs on the communication network;
• obtain, in a received message originating from a first terminal registering or being registered to the communication network by way of an access network, a second set of coding formats supported by a first terminal, a type of access network, and a type of communication service which are used by the first terminal;
• determine a third set of coding formats, the third set comprising the coding formats of the first set corresponding to coding formats of the second set and associated with the type of access network and the type of communication service used by the first terminal;
• in response to the third set of coding formats being empty, unregister the first terminal;
• and
• in response to the third set of coding formats being not empty, use solely coding formats of the third set for negotiating establishment of communications of the first terminal via the communication network by way of the access network.