Method and communication system for transferring messages containing audio and/or voice information

1. A method for transferring a PTT message from a transmitting communication terminal to a receiving communication terminal, the method including:

selecting at the receiving communication terminal a communication format a user of the receiving communication terminal prefers to receive,

transmitting information regarding the communication format from the receiving communication terminal to at least one communication server informing the server about whether the user of the receiving communication terminal prefers a direct PTT communication or an asynchronous MMS communication,

storing the information comprising the communication format at the at least one server, and

upon receipt of the PTT message at the at least one server from the transmitting communication terminal:

accessing the stored information comprising the communication format,

determining whether the user prefers a direct PTT communication or an asynchronous MMS communication, and

directly forwarding the PTT message to the receiving communication terminal to directly play back the message if the information indicates a user preference for direct communication, or

temporarily storing the PTT message at least one of the server or the receiving communication terminal as an MMS voice message to be played back at a later time point if the information indicates a user preference for asynchronous communication.

2. The method of claim 1 , wherein the message is transferred via a communication network comprising the at least one communication server.

3. The method of claim 2 , wherein the message is temporarily stored at said communication server.

4. The method of claim 1 , wherein the message is temporarily stored at said receiving communication terminal.

5. The method of claim 1 , wherein the message is transferred from said transmitting communication terminal as a PTT message.

6. The method of claim 1 , wherein at least one of the communication terminals is a mobile communication terminal.

7. The method of claim 6 , wherein said mobile communication terminal is a mobile phone.

8. The method of claim 1 , wherein temporarily storing the PTT message comprises: automatically converting the PTT message into the MMS voice message if the information indicates a user preference for asynchronous communication.

9. A communication system comprising:

a transmitting communication terminal for transferring a PTT message,

a receiving communication terminal for receiving said message, the receiving communication terminal being configured to select a communication format a user of the receiving communication terminal prefers to receive and to transmit information regarding the communication format to at least one communication server informing the server about whether the user of the receiving communication terminal prefers a direct PTT communication or an asynchronous MMS communication, and

the at least one communication server configured to store the information comprising the communication format,

wherein upon receipt of the PTT message at the at least one server, the server is configured to access the stored information comprising the communication format, determine whether the user prefers a direct PTT communication or an asynchronous MMS communication, and directly forward the PTT message to the receiving communication terminal to directly play back the message if the information indicates a user preference for direct communication, or temporarily store the PTT message at least one of the server or the receiving communication terminal as an MMS voice message to be played back at a later time point if the information indicates a user preference for asynchronous communication.

10. The communication system of claim 9 , further comprising a communication network with the at least one communication server for forwarding the message.

11. The communication system of claim 10 , wherein the message is temporarily stored at said communication server.

12. The communication system of claim 9 , wherein the message is temporarily stored at said receiving communication terminal.

13. The communication system of claim 9 , wherein the message is transferred from said transmitting communication terminal as a PTT message.

14. The communication system of claim 9 , wherein at least one of the communication terminals is a mobile communication terminal.

15. The communication system of claim 14 , wherein said mobile communication terminal is a mobile phone.

16. The communication system of claim 9 , wherein the server is configured to automatically convert the PTT message into the MMS voice message if the user prefers an asynchronous communication format.