Delivery of identification information

A terminal for a communications network, the terminal comprising:

• at least one processor;
• at least one memory including computer program code;
• and
• at least one interface unit;
• the at least one memory and the computer program code configured to, with the at least one processor, cause the terminal at least to:
• operate in direct mode;
• communicate with a trunked mode terminal via a direct mode gateway such that messages of the terminal in the communications network side are addressed with an address of the direct mode gateway;
• send identification information of the terminal to the trunked mode terminal in a user plane signalling message of a communication session, the user plane signalling message being a signalling message that steals communication resource from user plane traffic messages of the communication session.

A terminal for a communications network, the terminal comprising:

• at least one processor;
• at least one memory including computer program code;
• and
• at least one interface unit;
• the at least one memory and the computer program code configured to, with the at least one processor, cause the terminal at least to:
• implement a communication session;
• perform a terminal procedure applying identification information of a participant of the communication session;
• receive identification information of the other terminal in a user plane signalling message of the communication session, the user plane signalling message being a signalling message that steals communication resource from user plane traffic messages of the communication session;
• and
• use in the terminal procedure the identification information of the other terminal received in the user plane signalling message.

A direct mode gateway for a communications network, comprising:

• at least one processor;
• at least one memory including computer program code;
• and
• at least one interface unit;
• the at least one memory and the computer program code configured to, with the at least one processor and the at least one interface unit, cause the direct mode gateway at least to:
• communicate with terminals in direct mode and terminals in trunked mode;
• mediate communications of a first terminal such that messages of the first terminal are addressed in the communications network with identification information of the direct mode gateway;
• p1 deliver identification information of the first terminal to the second terminal in a user plane signalling message of the communication session, the user plane signalling message being a signalling message that steals communication resource from user plane traffic messages of the communication session.

A communications system comprising:

• a first terminal and a second terminal;
• a direct mode gateway configured to mediate communications of the first terminal in direct mode such that messages of the first terminal are addressed in the communications network with identification information of the direct mode gateway;
• the second terminal is configured to implement a terminal procedure applying identification information of a participant of the communication session;
• the first terminal or the direct mode gateway is configured to deliver identification information of the first terminal to the second terminal in a user plane signalling message of the communication session, the user plane signalling message being a signalling message that steals communication resource from user plane traffic messages of the communication session;
• the second terminal is configured to use in the terminal procedure the identification information of the first terminal received in the user plane signalling message.

A computer program product embodied in an apparatus-readable non-transitory medium and comprising program instructions, wherein execution of said program instructions causes an apparatus containing the computer program product to participate in a communications network in a communication session between a group of participants and to perform one of processes comprising a first terminal process, a second terminal process and a gateway process, wherein

• the first terminal process comprises:
• operating in a direct mode;
• communicating with a trunked mode terminal via a direct mode gateway such that messages of the terminal in the communications network side are addressed with an address of the direct mode gateway;
• sending identification information of the terminal to the trunked mode terminal in a user plane signalling message of a communication session, the user plane signalling message being a signalling message that steals communication resource from user plane traffic messages of the communication session;
• the second terminal process comprises:
• operating in a trunked mode;
• performing a terminal procedure applying identification information of a participant of the communication session;
• receiving identification information of the direct mode terminal in the user plane signalling message of the communication session;
• using in the terminal procedure the identification information of the other terminal received in the user plane signalling message;
• and
• the gateway process comprises:
• communicating with terminals in direct mode and terminals in trunked mode;
• mediating communications of a first terminal operating in direct mode via a direct mode gateway such that messages of the first terminal are addressed in the communications network with identification information of the direct mode gateway;
• delivering identification information of the first terminal to a second terminal operating in trunked mode in the user plane signalling message of the communication session.