A method of establishing a connection between a first access node and a second access node via a core network having a first core network node, further core network nodes, and a final core network node. The first access node sends an access request to the first core network node, which stores a set of framing information parameters received in the access request. The first core network node initializes the connection to a further core network node and sends the parameter set together with an indication that transparent transmission is to be utilized after connection establishment. The initialization of the connection and storing of the parameter set and the indication is performed stepwise in further core network nodes until the final core network node is reached. The final core network node initializes the connection to the second access node, which stores the parameter set and the indication.