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Fine-Tuning E&M Voice Ports

Configuring Voice over IP for Cisco MC3810 Series Concentrators 25

Step Command Purpose

router# configure terminal

Enter global conﬁguration mode.

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

milliseconds

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.

router(config-voiceport)# condition {tx-a-bit |

tx-b-bit | tx-c-bit | tx-d-bit} {rx-a-bit |

rx-b-bit | rx-c-bit | rx-d-bit} {on | off |

invert}

(For T1/E1 digital voice ports only.) Conﬁgure the voice port to

manipulate the transmit and/or receive bit patterns to match the

bit patterns required by a connected device.

Be careful not to destroy the information content of the bit

pattern. For example, forcing the A-bit on or off will prevent

FXO interfaces from being able to generate both an on-hook and

off-hook state.

Note The show voice port command reports at the protocol

level, while the show controller command reports at the driver

level. The driver is not notiﬁed of any bit manipulation using the

condition command. As a result, the show controller command

output will not account for the bit conditioning.

router(config-voiceport)# define {Tx-bits |

Rx-bits}{seize | idle} {0000 | 0001 | 0010 |

0011 | 0100 | 0101 | 0110 | 0111 | 1000 | 1001 |

1010 | 1011 | 1100 | | 1101 | 1110 | 1111}

(For T1/E1 digital voice ports only.) Deﬁne speciﬁc transmit

and/or receive signaling bits to match the bit patterns required by

a connected device.

router(config-voiceport)# ignore {rx-a-bit |

rx-b-bit | rx-c-bit | rx-d-bit}

(For T1/E1 digital voice ports only.) Conﬁgure the voice port to

ignore speciﬁed transmit and/or receive bits.

router(config-voiceport)# timeouts initial

seconds

Specify the number of seconds the system waits for a caller to

dial the ﬁrst digit. The range is 0 to 120. The default is 10.

router(config-voiceport)# timeouts interdigit

seconds

Specify the number of seconds the system waits (after a caller

has dialed the initial digit) for the caller to dial each subsequent

digit. The range is 0 to 120. The default is 10.

router(config-voiceport)#timeouts ringing

{

seconds

| infinity}

Specify the maximum number of seconds that a voice port allows

ringing to continue if a call is not answered.

The range is 5 to 60000. The default is 180.

router(config-voiceport)# timeouts wait-release

{

seconds

| infinity}

Specify the maximum number of seconds that a voice port can

remain in the call failure state while the router or concentrator

sends a busy tone, reorder tone or out-of-service tone to the port.

The value range is 5 to 3600. The default is 30.

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Cisco MC3810 Guía de instalación Pagina 25

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