| 摘要 |
A TETRA gateway apparatus (1) can send and receive call traffic and SDS messages via radio signals with the fixed radio infrastructure (4) on the one hand, and can send and receive call traffic and SDS messages via radio signals with one or more direct mode operating terminals (2 and 3,) etc., on the other hand. The gateway apparatus (1) is also configured to be operable such that when it provides a gateway function to appropriate direct mode operating terminals, such as a TET.RA terminal (2), it can also allow a user (9) of the gateway apparatus 1 to participate in a call, etc., that is proceeding via the gateway apparatus (1). A TETRA direct mode repeater apparatus can similarly be configured to allow a user of the repeater apparatus to participate in a call, etc., that is proceeding via the repeater apparatus. |
