Specifications

Packages Reference Manual (MGCP/NCS Version)

Mediatrix 4100

3. Restart the Mediatrix 4100 so that the changes may take effect.

Extended Analog Line (XL) Package

The XL package meets the needs of the Line Reversal feature. Line Reversal is used by the call agent on one

or more endpoints (lines) of the Mediatrix 4100.

What is Line Reversal?

Line reversal consists of reversing the polarity of the tip/ring leads (GND becomes -48V and -48V switches to

GND). There are two ways in which line reversal is often used:

 Line reversal on seizure – This is used to prevent that a call originates from a line at the same

time that a call terminates to the line. The line reversal signal is applied on seizure to the

terminating/called party followed by ringing and maintained until the line is answered. Once

reversal has been applied, the line cannot attempt a simultaneous origination.

 Line reversal on answer – In this case, line reversal is applied to the originating party to control

electronic equipment such as coin phones or answering machines. The line reversal signal acts

as a stimulus to the equipment to perform specific actions such as dropping coins or activating

the answering machine.

A specific line reversal signal is needed for the call agent to have full control of the line polarity states. This

enables the call agent to control both line reversal on answer and line reversal on seizure by using one MGCP

signal. This approach maps well to the legacy method of setting/resetting a data flag to indicate line reversal

state.

mgcpLinePackageHfPersistent Indicates whether the flash hook event is persistent

or not. Persistent events in a given package are

always detected on an endpoint that implements that

package. If a persistent event is not included in the

list of RequestedEvents, and the event occurs, the

event is detected anyway, and processed like all

other events, as if the persistent event had been

requested with a Notify action.

• disable(0)

• enable(1)

Default Value: disable

mgcpLinePackageHuPersistent Indicates whether the on hook event is persistent or

not. Persistent events in a given package are always

detected on an endpoint that implements that