Methods and apparatus to enable call completion in internet protocol communication networks

A machine readable storage medium storing machine readable storing machine readable instructions which, when executed, cause a machine to perform a method comprising:

• sending a first query to a telephone number mapping server to obtain a session initiation protocol uniform resource identifier associated with a destination device with which a voice over Internet protocol call is to be established;
• in response to the voice over Internet protocol call failing to be established using the session initiation protocol uniform resource identifier obtained from the first query, sending a second query to the telephone number mapping server to obtain a numeric Internet protocol address associated with the destination device;
• and
• using the numeric Internet protocol address obtained from the second query to establish the voice over Internet protocol call with the destination device.

An apparatus to process a voice over Internet protocol call, the apparatus comprising:

• memory to store machine readable instructions;
• and
• a processor to execute the machine readable instructions to:
• send a first query to a telephone number mapping server to obtain a session initiation protocol uniform resource identifier associated with a destination device with which the voice over Internet protocol call is to be established;
• in response to the voice over Internet protocol call failing to be established using the session initiation protocol uniform resource identifier obtained from the first query, send a second query to the telephone number mapping server to obtain a numeric Internet protocol address associated with the destination device;
• and
• use the numeric Internet protocol address obtained from the second query to establish the voice over Internet protocol call with the destination device.