R0106-HP MSR Router Series Voice Configuration Guide(V7)

Configuring analog voice interfaces

Analog voice interfaces include FXS, FXO, and E&M interfaces.

FXS interface

A Foreign Exchange Station (FXS) interface connects to a standard telephone, fax machine, or a Private

Branch Exchange (PBX) through an RJ-11 connector and a telephone cable. It provides ring, voltage, and

dial tone based on level changes on the Tip/Ring line. An FXS interface can only connect to an FXO

interface.

FXO interface

A foreign exchange office (FXO) interface connects to a PBX through an RJ-11 connector and a telephone

cable. It provides ring, voltage, and dial tone based on level changes on the Tip/Ring line. An FXO

interface can only connect to an FXS interface.

E&M interface

An ear & mouth or receive & transmit (E&M) interface is a common trunk line that connects to a PBX

through an RJ-48 connector. The E&M interface supports E&M signaling. The E signaling receives signals

from the peer, and the M signaling sends signals to the peer. An E&M interface can only connect to an

E&M interface.

Configuration task list

Tasks at a

lance

(Optional.) Configuring basic functions

(Optional.) Configuring call progress tones

(Optional.) Configuring an FXS interface

• Configuring CID

• Setting the electrical impedance

• Configuring the packet loss compensation mode

• Configuring an FXS interface to send LCFO signals

(Optional.) Configuring an FXO interface

• Configuring CID

• Configuring busy tone detection

• Configuring an on-hook delay

• Configuring the off-hook mode

• Configuring ring detection parameters

• Setting the electrical impedance

• Configuring the packet loss compensation mode