Abstract: This gateway includes means for creating a first instance of a first push-to-talk client adapted to communicate with a second push-to-talk client via a first telecommunications network; means for setting up a call with a service provider on a second telecommunications network; and control means adapted to set up a first communications channel between the first instance of the first push-to-talk client and the communications means to set up a logical session between a second push-to-talk client and the service provider.

Abstract: The invention relates to a method of processing a multimedia message sent by a telecommunications terminal of one party to a telecommunications terminal of a recipient, said message containing at least one identification element for the terminal and at least one audio or video multimedia object. The method comprises the following steps: extracting said multimedia message from said audio or video object; storing said object in multimedia object storage means; creating a location address of the storage location of said audio or video object in said multimedia object storage means; and inserting said location address in the multimedia message instead of said audio or video object to constitute a substitute multimedia message. The invention also relates to a multimedia message processing system.