Method to process a call request

A method of establishing a communication session in a packet-based network, the method comprising, in a communication session controller:

• receiving a communication session request from an originating device, the communication session request comprising a destination address;
• establishing a communication session with the originating device, the communication session including a communication session identifier;
• based on the destination address, setting up a first media path between the originating device and a first destination device, the first media path not including the communication session controller;
• taking down the first media path between the originating device and the first destination device while maintaining the communication session with the originating device;
• and
• after taking down the first media path, setting up a second media path in the communication session using the communication session identifier, the second media path extending between the originating device and a second destination device, the second media path not including the communication session controller.