A mobile device executes an operating system (OS) call manager and an over-the-top (OTT) calling application. The OTT calling application receives a notification for a first OTT call, and notifies the OS call manager of the first OTT call. The OS call manager assigns shared device resources of the mobile device to the first OTT call. The OTT calling application receives a notification for a second OTT call, and sends, to an OTT Telephony Application Server (TAS) without notifying the OS call manager of the second OTT call, a request to switch from the first OTT call to a second OTT call. The OTT calling app identifies the first OTT call as inactive and the second OTT call as active, and allocates the shared device resources assigned to the first OTT call to the second OTT call.

A mobile device executes an operating system (OS) call manager and an over-the-top (OTT) calling application. The OTT calling application receives a notification for a first OTT call, and notifies the OS call manager of the first OTT call. The OS call manager assigns shared device resources of the mobile device to the first OTT call. The OTT calling application receives a notification for a second OTT call, and sends, to an OTT Telephony Application Server (TAS) without notifying the OS call manager of the second OTT call, a request to switch from the first OTT call to a second OTT call. The OTT calling app identifies the first OTT call as inactive and the second OTT call as active, and allocates the shared device resources assigned to the first OTT call to the second OTT call.

A mobile device executes an operating system (OS) call manager and an over-the-top (OTT) calling application. The OTT calling application receives a notification for a first OTT call, and notifies the OS call manager of the first OTT call. The OS call manager assigns shared device resources of the mobile device to the first OTT call. The OTT calling application receives a notification for a second OTT call, and sends, to an OTT Telephony Application Server (TAS) without notifying the OS call manager of the second OTT call, a request to switch from the first OTT call to a second OTT call. The OTT calling app identifies the first OTT call as inactive and the second OTT call as active, and allocates the shared device resources assigned to the first OTT call to the second OTT call.

A mobile device executes an operating system (OS) call manager and an over-the-top (OTT) calling application. The OTT calling application receives a notification for a first OTT call, and notifies the OS call manager of the first OTT call. The OS call manager assigns shared device resources of the mobile device to the first OTT call. The OTT calling application receives a notification for a second OTT call, and sends, to an OTT Telephony Application Server (TAS) without notifying the OS call manager of the second OTT call, a request to switch from the first OTT call to a second OTT call. The OTT calling app identifies the first OTT call as inactive and the second OTT call as active, and allocates the shared device resources assigned to the first OTT call to the second OTT call.

A location application can be configured to detect a call to a particular telephone number. The location application can also be configured to receive a plurality of radio frequency (RF) signals provided through a plurality of different RF interfaces. Each of the RF interfaces can be configured to receive RF signals of different protocols. The location application can also be configured to determine an identifier (ID) for a source of each of the RF signals. At least two of the RF signals can be of different protocols. The location application can also be configured to insert the ID for the sources of each of the RF signals into call signaling for the call.

A location application can be configured to detect a call to a particular telephone number. The location application can also be configured to receive a plurality of radio frequency (RF) signals provided through a plurality of different RF interfaces. Each of the RF interfaces can be configured to receive RF signals of different protocols. The location application can also be configured to determine an identifier (ID) for a source of each of the RF signals. At least two of the RF signals can be of different protocols. The location application can also be configured to insert the ID for the sources of each of the RF signals into call signaling for the call.