Method to process a call request

1. A communication session controller, comprising:

at least one communication interface for coupling the communication session controller to a packet data network; and

at least one control unit coupled to the at least one communication interface and configured:

to receive a communication session request from an originating device over the packet data network, the communication session request comprising a destination address;

to establish a communication session with the originating device over the packet data network and to associate an identifier with the communication session;

to send a first communication path request to a first destination device, the first communication path request including the identifier associated with the communication session;

to establish a first communication path from the originating device to the first destination device to enable communication between the originating device and the first destination device;

to receive a termination message from the first destination device, the termination message including the identifier associated with the communication session;

to terminate the first communication path between the originating device and the first destination device;

to send a second communication path request to a second destination device, the second communication path request including the identifier associated with the communication session; and

to establish a second communication path from the originating device to the second destination device to enable communication between the originating device and the second destination device.

2. The communication session controller of claim 1 , wherein the at least one control unit is further configured:

to receive a termination message from the second destination device, the termination message including the identifier associated with the communication session;

to send a termination message to the originating device over the packet data network; and

to terminate the second communication path between the originating device and the second destination device.

3. The communication session controller of claim 2 , wherein the termination message received from the second destination device is a Session Initiation Protocol (SIP) Bye message.

4. The communication session controller of claim 2 , wherein the termination message sent to the originating device is a SIP Bye message.

5. The communication session controller of claim 1 , wherein the communication session request is a SIP Invite message comprising the identifier associated with the communication session.

6. The communication session controller of claim 1 , wherein the at least one control unit is further configured to provide a SIP ringing response to the originating device responsive to receipt of the communication session request.

7. The communication session controller of claim 1 , wherein the termination message received from the first destination device is a SIP Bye message.

8. The communication session controller of claim 1 , wherein the first communication path request is a SIP Invite message including the identifier associated with the communication session.

9. The communication session controller of claim 1 , wherein the second communication path request is a SIP Invite message including the identifier associated with the communication session.

10. The communication session controller of claim 1 , wherein the at least one control unit is further configured to enable communication between the originating device and the first destination device responsive to receipt of a SIP ringing response to the first communication path request received from the first destination device.

11. The communication session controller of claim 1 , wherein the at least one control unit is further configured to enable communication between the originating device and the second destination device responsive to receipt of a SIP ringing response to the second communication path request received from the second destination device.

12. The communication session controller of claim 1 , wherein the at least one control unit is further configured to send a third communication path request to the originating device over the packet data network, the third communication path request including the identifier associated with the communication session.

13. The communication session controller of claim 12 , wherein the third communication path request is a SIP Invite message.

14. The communication session controller of claim 12 , wherein:

the first communication path request comprises the identifier associated with the communication session and a first sequence number; and

the third communication path request comprises the identifier associated with the communication session and a second sequence number that is higher than the first sequence number in the first communication path request.

15. The communication session controller of claim 1 , wherein the first destination device is an interactive voice response system.

16. The communication session controller of claim 1 , wherein the second destination device is a contact agent system.

17. The communication session controller of claim 1 , wherein the second communication path enables voice communication between the originating device and the second destination device.

18. The communication session controller of claim 1 , wherein the second communication path enables video communication between the originating device and the second destination device.

19. The communication session controller of claim 1 , wherein the second communication path enables text communication between the originating device and the second destination device.

20. The communication session controller of claim 1 , wherein the identifier associated with the communication session comprises an identifier associated with the originating device.