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Fine-Tuning FXO and FXS Voice Ports

Configuring Voice over IP for Cisco MC3810 Series Concentrators 19

Fine-Tuning FXO and FXS Voice Ports

Depending on the speciﬁcs of your particular network, you may need to adjust voice parameters

involving timing, input gain, and output attenuation. The commands for these parameters are

referred to as voice-port tuning commands.

Note In most cases, the default values for voice-port tuning commands will be sufﬁcient.

Task List

To ﬁne tune FXO and FXS voice ports, perform the following tasks:

1 Perform the voice-port tuning procedure for the voice port.

2 Verify the conﬁguration.

3 Troubleshoot and correct any conﬁguration errors.

Voice-Port Tuning Procedure

To ﬁne-tune FXO and FXS voice ports, perform the following optional steps, beginning in global

conﬁguration mode. Commands apply to both analog and digital voice ports unless otherwise

indicated.

Note After you change voice-port parameters, Cisco recommends that you cycle the port by

entering the shutdown and no shutdown commands.

Step Command Purpose

router(config)#voice-port

slot/port

Identify the voice port you want to conﬁgure and enter voice-port

conﬁguration mode.

router(config-voiceport)#input gain

value

Specify the receive gain (in dB) for the voice port. Value range is

–6 to 14.

router(config-voiceport)#output attenuation

value

Specify the transmit attenuation (in dB) for the voice port. Value

range is 0 to 14.

router(config-voiceport)#echo-cancel enable

Enable echo-cancellation of voice that is sent out the interface

and received back on the same interface.

router(config-voiceport)#echo-cancel coverage

{16 | 24 | 32}

Set the duration (in milliseconds) of echo cancellation. Values

are 16, 24, and 32.

router(config-voiceport)#non-linear

Enable non-linear processing, which shuts off any signal if no

near-end speech is detected. (Non-linear processing is used with

echo-cancellation.)

router(config-voiceport)#playout-delay

Tune the playout buffer to accommodate packet jitter caused by

switches in the WAN.

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