Cisco MC3810-APM-FXO= Datasheet download pdf (Page 50)

Configuring Voice Ports

Configuring Digital Voice Ports

VC-84

Cisco IOS Voice, Video, and Fax Configuration Guide

To change parameters related to disconnect supervision, use the following commands as appropriate, in

voice-port configuration mode:

Command Purpose

Step 1

Router(config-voiceport)# no battery-reversal

(Analog only) Enables battery reversal. The

default is that battery reversal is enabled.

• For FXO ports—Use the no battery-reversal

command to configure a loop-start voice port

not to disconnect when it detects a second

battery reversal. The default is to disconnect

when a second battery reversal is detected.

This functionality is supported on

Cisco MC3810 analog voice ports; on

Cisco 1750, Cisco 2600 series, and

Cisco 3600 series routers, only analog voice

ports on VIC-2FXO cards are able to detect

battery reversal.

–

Also use the no battery-reversal

command when a connected FXO port

does not support battery reversal

detection.

• For FXS ports—Use the no battery-reversal

command to configure the voice port not to

reverse battery when it connects calls. The

default is to reverse battery when a call is

connected, then return to normal when the call

is over, providing positive disconnect.

See also the disconnect-ack command (Step 7).

Step 2

Router(config-voiceport)# no supervisory disconnect

(FXO only) Enables the PBX or PSTN switch to

provide STD. By default the supervisory

disconnect command is enabled.

Step 3

Router(config-voiceport)# disconnect-ack

(FXS only) Configures the voice port to return an

acknowledgment upon receipt of a disconnect

signal. The FXS port removes line power if the

equipment on the FXS loop-start trunk

disconnects first. This is the default.

The no disconnect-ack command prevents the

FXS port from responding to the on-hook

disconnect with a removal of line power.

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Cisco MC3810-APM-FXO= Datasheet Page 50

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