Cisco MC3810-APM-FXO= Datasheet download pdf (Page 51)

Configuring Voice Ports

Configuring Digital Voice Ports

VC-85

Cisco IOS Voice, Video, and Fax Configuration Guide

FXO Supervisory Disconnect Tone Commands

If the FXO supervisory disconnect tone is configured and a detectable tone from the PSTN or PBX is

detected by the digital signal processor (DSP), the analog FXO port goes on-hook. This feature prevents

an analog FXO port from remaining in an off-hook state after an incoming call is ended. FXO

supervisory disconnect tone enables interoperability with PSTN and PBX systems whether or not they

transmit supervisory tones.

Note This feature applies only to analog FXO ports with loop-start signaling on the Cisco 2600 and 3600

series routers and on Cisco MC3810 multiservice concentrators with high-performance compression

modules (HCMs).

To configure a voice port to detect incoming tones, you need to know the parameters of the tones

expected from the PBX or PSTN. Then create a voice class that defines the tone detection parameters,

and, finally, apply the voice class to the applicable analog FXO voice ports. This procedure configures

the voice port to go on-hook when it detects the specified tones. The parameters of the tones need to be

precisely specified to prevent unwanted disconnects due to detection of nonsupervisory tones or noise.

A supervisory disconnect tone is normally a dual tone consisting of two frequencies; however, tones of

only one frequency can also be detected. Use caution if you configure voice ports to detect nondual

tones, because unwanted disconnects can result from detection of random tone frequencies. You can

configure a voice port to detect a tone with one on/off time cycle, or you can configure it to detect tones

in a cadence pattern with up to four on/off time cycles.

Note In the following procedure, the following commands were not supported until Cisco IOS Release

12.2(2)T: freq-max-deviation, freq-max-power, freq-min-power, freq-power-twist, and

freq-max-delay.

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Cisco MC3810-APM-FXO= Datasheet Page 51