Testing call routing

A system comprising:

• a call testing device to:
• place a call directed to a network address or a number,
• establish a communication session between the call testing device and a call agent device associated with the network address or the number, via a call routing device that forwards the call from the call testing device to the call agent device,
• receive a message during the communication session,
• extract a first identifier from the message received during the communication session,
• compare the first identifier with a second identifier associated with e call, and
• determine whether the call routing device that forwarded the call to the call agent device operates correctly based on the comparison;
• and
• the call agent device to:
• receive the call forwarded by the call routing device,
• establish the communication session with the call testing device,
• determine the first identifier based on the forwarded call,
• look up the message based on the first identifier, and
• send the message to the call testing device during the communication session.

A device comprising:

• a transceiver to:
• receive a call, from a call testing device, forwarded by a call routing device,
• communicate with the call testing device;
• and
• one or more processors to:
• establish a communication session between the device and the call testing device;
• select a message based on information received from the call routing device, the information identifying the device, and
• send the message over the communication session to the call testing device, to identify a virtual call agent.