A mechanism for controlling a transmission of data messages in a communication network, including executing a registration procedure, sending a request message including registration information from a message gateway entity to a home subscriber database by using a Mobile Application Part signaling, wherein the request message further comprises information elements including registration and address data related to the message gateway entity, storing the registration information and information elements in the home subscriber database, and using the stored registration information and information elements for responding, by the home subscriber database, to a routing information request for transmitting a data message to a destination connected to the message gateway entity.