Method for preserving the sequence of messages in sip/sip-t protocol

A method for transmitting a message in a communications network, comprising:

• providing a plurality of subscribers in the communications network;
• providing a first media gateway controller and a second media gateway controller, each media gateway controller controlling a media gateway;
• transmitting a session message in an IP network included in the communications network;
• allocating a sequence number in the session message;
• sending the session message including bearer information via the first media gateway;
• reproducing the sequence number by the second media gateway controller;
• and
• providing a sequence number option, the sequence number determined by a method selected from resetting the sequence number to an initial value and incrementing the sequence number.

A method for transmitting a message in a communications network, comprising:

• providing a plurality of subscribers in the communications network;
• providing a first media gateway controller and a second media gateway controller, each media gateway controller controlling a media gateway;
• transmitting a session message in an IP network in the communications network;
• sending the session message including bearer information via the first media gateway;
• and
• waiting to send a subsequent session message until the first media gateway receives an acknowledgement to the session message.

A first media gateway controller and a second media gateway controller included in a communications network, comprising:

• a plurality of subscribers in the communications network, the subscribers selected from the group consisting of PSTN subscriber, mobile radio subscribers and combinations thereof;
• an IP network in the communications network;
• a session message transmitted in the IP network to the first media gateway controller, the session message including bearer information;
• a sequence number included in the session message by the first media gateway controller, reproduced by the second media gateway controller, and returned in an acknowledgement message;
• and
• a sequence number option providing a method selected from the group consisting of resetting the sequence number to an initial value and incrementing the sequence number,
• wherein each media gateway controller controls a media gateway.