Systems and methods for managing communication sessions at endpoints accessible via more than one network

A mobile communication endpoint, comprising:

• at least one processor;
• a display;
• at least one transceiver operative to exchange signals, over a first communication network, with a second communication endpoint in a first communication session, based on execution of instructions of a first communication application by the at least one processor;
• and
• a memory containing instructions, executable by the at least one processor, to
• receive, at the first mobile communication endpoint, an invitation to establish a second communication session with a third communication endpoint over a communication network, wherein the first mobile communication endpoint is provisioned to handle the second communication session by executing a second communication application at the first mobile communication endpoint;
• and
• process the received invitation according to a specified call treatment option without interruption of the first communication session.

A non-transitory computer readable medium containing instructions, executable by the processor of a first mobile communication endpoint having a display and a transceiver, for:

• communicating with a second communication endpoint in a first communication session between the first mobile communication endpoint and the second communication endpoint over a first communication network, wherein the communicating comprises executing a first communication application at the first mobile communication endpoint;
• receiving, at the first mobile communication endpoint, an invitation to establish a second communication session with a third communication endpoint over a communication network that is different from the first communication network, wherein the first mobile communication endpoint is provisioned to handle the second communication session by executing a second communication application at the first mobile communication endpoint;
• and
• processing the received invitation according to a specified call treatment option without interruption of the first communication session.