In response to receiving the second call, the first user is prompted with call-back options to respond to the second call (606).

Establishing (210) the second call, simultaneously with the first call, over the second network with the same final endpoint.

The first digital call is converted to a format of a second local phone network to generate a second call.

A result of the second call is statically computed in the optimizer by issuing the second call with the constants as arguments.

The apparatus may be configured to establish a first call for a first subscription, and accept a second call for a second subscription while maintaining the first call.

The apparatus may be configured to establish a first call for a first subscription, and accept a second call for a second subscription while maintaining the first call.

The apparatus may be configured to establish a first call for a first subscription, and accept a second call for a second subscription while maintaining the first call.

The communication bridge bridges the first call to the second call.

The second call is transmitted to a second user phone over the second local phone network.

The user (10) can then decide whether to accept the second telephone call from the second caller (12), putting the first caller (11) on hold, or to refuse the second telephone call.

The first telephone call and the second telephone call are connected.

After comparison, it is determined whether the first and the second calls are fraudulent telephone calls.

Initiating (208) a second call to the destination by sending a request message for a second call of a second network (120), having a second network type, the request message including the temporary endpoint identifier.

The process further includes selectively transmitting communications (608) from the UE to an active call selected from one of the first call or the second call.

The host is capable of making a second direct call to the guest user process.