Methods, network control nodes and communication devices for routing signalling requests in a communication system

A method performed by a communication device for communicating in a communication system comprising a home communication network and a visiting communication network, the communication device subscribing to the home communication network and having a home subscriber identification, ID, and contacting the visiting communication network using its home subscriber ID, the method comprising:

• receiving a local subscriber ID from the visiting network, for communication in the visiting network, the local subscriber ID being associated with the home subscribed ID,
• changing from the home subscriber ID to the local subscriber ID,
• registering to the visiting network using the local subscriber ID, and
• sending a signaling request to the visiting network comprising the local subscriber ID.

A first network control node for routing a signaling request in a communication system comprising a home communication network and a visiting communication network, the signaling request originating from a communication device subscribing to the home communication network and having a home subscriber identification (ID), the communication device being registered to the visiting communication network with a local subscriber ID different from the home subscriber ID, the local subscriber ID being associated with the home subscriber ID, the first network control node comprising a processor and a memory, said memory containing instructions executable by said processor whereby said first network control node is operative for:

• receiving the signaling request originating from the communication device, the signaling request comprising the local subscriber ID;
• detecting that the local subscriber ID is associated with the home subscriber ID;
• replacing, in the signaling request, the local subscriber ID with the home subscriber ID;
• sending the signaling request comprising the home subscriber ID to a subscriber database of the home network.