Network and node for providing a secure transmission of mobile application part messages

The telecommunication network with a first domain (PLMN-A) comprising at least one request protocol Mobile Application Part, MAP, connected to a gateway mode (MSEGA) adapted to send and receive MAP messages and which is connectable a second domain (PLMN-B, PLMN-C), wherein the gateway node (MSEGA) is adapted to receive a MAP message from the first domain (PLMN-a), to convert the MAP message received obtaining a MAP message secured and send the message received by the second domain (PLMN-B, PLMN-C), the gateway node (MSEGA) further is adapted to receive a MAP message secured from the second domain (PLMN-B, PLMN-C), MAP to extract a message from uninsured insured received MAP message and to send the message drawn into the first domain (PLMN-a).