Telephony application server charging for evolved packet system fallback

A system comprising:

• one or more processors;
• and
• memory storing computer-executable instructions that, when executed by the one or more processors, cause the system to perform operations comprising:
• establishing a first portion of a communication over a first network at a first time;
• establishing a second portion of the communication over a second network at a second time different from the first time;
• accessing, by a server, an identifier of a user equipment (UE) associated with the communication, the identifier indicating a type of technology of the first network at the first time;
• determining, by the server, a change in the identifier associated with the UE;
• and
• determining, by the server, a first charge for the UE associated with the communication over the first network and a second charge for the UE associated with the communication over the second network.

A computing device comprising:

• one or more processors;
• and
• memory storing computer-executable instructions that, when executed by the one or more processors, cause the computing device to perform operations comprising:
• establishing a first portion of a communication over a first network at a first time;
• establishing a second portion of the communication over a second network at a second time different from the first time;
• accessing, by the computing device, an identifier of a user equipment (UE) associated with the communication, the identifier indicating a type of technology of the first network at the first time;
• determining, by the computing device, a change in the identifier associated with the UE;
• and
• determining, by the computing device, a first charge for the UE associated with the communication over the first network and a second charge for the UE associated with the communication over the second network.