Configuring Voice Ports

Step	Command	Purpose
1	router(config)# voice-port slot/port	Enter voice-port configuration mode. The voice-port configuration commands are nested so that all subsequent commands affect only the specified voice port. The slot number for analog voice ports on the Cisco  MC3810 is always 1. There is no port 0 for voice ports.
2	router(config-voiceport)# codec {g729r8 | g729ar8 | g726r32 | g711alaw | g711ulaw}	(Optional) Configure the voice-port compression mode. The g729ar8 value is the default and is recommended. The g729ar8 compression mode can support a maximum of 24 simultaneously active on-net voice calls, while the g729r8 value can only support a maximum of 12. The g729r8 and g729ar8 compression modes have a nominal data rate of 8  kbps. The g726r32 compression mode has a nominal data rate of 32  kbps. The g711alaw and g711ulaw compression modes have a nominal data rate of 64  kbps.
3	router(config-voiceport)# connection {tie-line | plar | plar-opx} string	Configure the voice-port connection mode type. If the connection will be to a PBX, use the tie-line option. If the connection will be for Private Line Auto Ringdown (PLAR), use the plar option. If the connection will be for PLAR Off-Premises eXtension (OPX), use the plar-opx option. Using this option, the local voice port will provide a local response before the remote voice port receives an answer. For this option, FXO interfaces will not answer until the remote side answers. Note After a transparent Common Channel Signaling (CCS) connection is configured by entering the connection plar command, any change to the configuration after that will not take place until the connection is shut down and then restarted with a shutdown command and a no shutdown command. For example, the phone number supplied in the plar command can be changed while the connection is in no shutdown state, but the change will not cause the current connection to be closed and a new connection opened to the new phone number. This will only take effect on the next no shutdown command after a shutdown command.

To configure optional voice-port settings for analog voice ports, proceed to the next section.

To configure the optional voice-port settings for analog voice ports, complete the following tasks while in voice-port configuration mode:

Step	Command	Purpose
1	router(config-voiceport)# voice confirmation-tone	If you configured the connection command for PLAR or PLAR OPX, you can disable the two-beep confirmation tone that a caller hears when picking up the handset. This command applies only when a port is configured for PLAR to draw the dial tone from a remote PBX.
2	If you want to change the default signaling type for the voice port, enter one of the following:
	router(config-voiceport)# signal {loop-start | ground-start}	Configure the signaling type for the FXO and FXS voice ports. The default is loop-start.
	router(config-voiceport)# signal {wink-start | immediate | delay-dial}	Configure the signaling type for the E&M voice ports. The default is wink-start.
3	router(config-voiceport)# dial-type {pulse | dtmf}	Configure the voice-port dial type. The default is dtmf (FXO and E&M voice ports only). If you configure the voice port to support pulse dialing, the different voice port signaling types handle pulse in the following way: FXO---Transmits but does not receive pulse dialing FXS---Does not transmit, but receives pulse dialing E&M---Transmits and receives pulse dialing
4	router(config-voiceport)# cptone country	Configure the call progress tone. Using this command, configure the voice port for the local territory's call progress tone setting. The call progress tone setting determines the settings for dialtone, busytone, and ringback tone. The call progress tone is different from the dual tone multifrequency (DTMF) tone. The default for this command is northamerica. For a list of supported countries, see the Cisco IOS Voice, Video, and Home Applications Command Reference.
5	router(config-voiceport)# description LINE	Enter a string description for the voice port for the LINE value. The string describes the voice port in displays. You can use the description command to note the voice port's location or use.

To activate the analog voice port, enter the following command in voice-port configuration mode:

Step	Command	Purpose
1	router(config-voiceport)# no shutdown	Activate the voice port. You should only activate voice ports you are planning to use.

After you have configured the basic voice-port settings, choose one of the following:

Step	Command	Purpose
1	router(config)# controller {t1 | e1} number	Enter controller configuration mode. Specify whether your controller is E1 or T1, and enter the controller number. The number should be 0 if the controller is for the interface to the local phone device or PBX (through the DVM). The number should be 1 for the interface to the WAN (through the MFT).
2	router(config-controller)# mode cas	Configure the T1/E1 line to support CAS. Note This procedure does not configure support for Q.SIG PBX signaling. For more information, see "Configuring Support for PBX Signaling Formats."
3	router(config-controller-cas)# voice-group   voice-group-no   timeslots timeslot-list  type {e&m-immediate | e&m-delay | e&m-wink  | e&m-melcas | fxs-ground-start | fxs-loop-start | fxs-melcas | fxo-ground-start | fxo-loop-start | fxo-melcas)	Configure a list of timeslots to form a CAS group for the T1/E1 line. The "melcas" options are supported only on E1 and apply to the Mercury Exchange Limited (MEL) standard, used primarily in the United Kingdom. When configuring a CAS group for a T1/E1 line to a PBX, make sure the channel numbers configured match the channels on the PBX. Contact the PBX administrator to determine which channels to use. Note If the mode cas command is not entered, the voice-group command is not visible when you enter a question mark (?) to display available controller-cas commands.
4	Repeat step 3 for each CAS group defined. After the CAS groups are defined, exit CAS controller configuration mode.

This completes the required digital voice-port configuration.

Configuring Optional Voice-Port Settings for Digital Voice Ports

To configure the optional voice-port settings for digital voice ports, complete the following tasks beginning in configuration mode:

Step	Command	Purpose
1	router(config)# voice-port slot/port	Enter voice-port configuration mode. The voice-port configuration commands are nested so that all subsequent commands affect only the specified voice port. The slot number should be 0 if the voice port is for the interface to the local phone device or PBX (through the DVM). The slot number should be 1 for the interface to the WAN (through the MFT). The slot number should match the number value entered in the controller {t1 | e1} command. For digital T1, valid port numbers are 1-24. For digital E1, valid port numbers are 1-15 and 17-31.
2	router(config-voiceport)# dial-type {pulse | dtmf}	Configure the voice-port dial type. The default is dtmf (FXO and E&M voice ports only). If you configure the voice port to support pulse dialing, the different voice port signaling types handle pulse in the following way: FXO---Transmits but does not receive pulse dialing FXS---Does not transmit, but receives pulse dialing E&M---Transmits and receives pulse dialing
3	router(config-voiceport)# compand-type {u-law | a-law}	Configure the companding standard to convert between analog and digital signals in PCM systems. The default is u-law, which specifies the North American mu-law ITU-T PCM encoding standard. Specify a-law to use the European a-law ITU-T PCM encoding standard.
4	router(config-voiceport)# description LINE	Enter a string description for the voice port for the LINE value. The string describes the voice port in displays. You can use the description command to note the voice port's location or use.

Activating the Digital Voice Port

To activate the analog voice port, enter the following command in voice-port configuration mode:

Step	Command	Purpose
1	router(config-voiceport)# no shutdown	Activate the voice port. You should only activate voice ports you are planning to use.

After you have configured the basic voice-port settings, choose one of the following:

To configure general voice-port tuning options, complete the following in voice-port configuration mode:

Step	Command	Purpose
1	router(config-voiceport)# input gain value	Configure the input gain value in decibels for the receiver side of the interface. The value represents the amount of gain to be inserted at the receiver side of the interface. The acceptable value is any integer from -6 to 14. The default is 0.
2	router(config-voiceport)# output attenuation value	Configure the output attenuation value in decibels for the transmit side of the interface. The value represents the amount of loss to be inserted at the transmit side of the interface. The acceptable value is any integer from 0 to 14. The default is 0.
3	router(config-voiceport)# echo-cancel enable	Enable echo cancel coverage.
4	router(config-voiceport)# echo-cancel  coverage {8|16|24|32}	Configure the number of milliseconds the echo cancel will cover on a given signal. The default is 16.
5	Configure the voice-port timeout values:
	router(config-voiceport)# timeouts initial seconds	Configure the initial timeouts value. The initial timeout value specifies the number of seconds the system waits for the caller to input the first digit of the dialed digits. The default is 10 seconds.
	router(config-voiceport)# timeouts interdigit seconds	Configure the interdigit timeouts value. The timeouts interdigit value specifies the number of seconds the system waits (after the caller has input the initial digit) for the caller to input a subsequent digit. The default is 10  seconds. The timeouts interdigit command is used in conjunction with variable length dial plans. For more information, see the "Variable-Length Dial Plans" section.
6	If the voice-port dial type is DTMF, configure the DTMF timing values:
	router(config-voiceport)# timing digit milliseconds	Configure the DTMF digit signal duration. The range of the DTMF digit signal duration is from 50-100. The default is 100.
	router(config-voiceport)# timing inter-digit milliseconds	Configure the DTMF interdigit signal duration. The range of the DTMF interdigit signal duration is from 50-500. The default is 100.
7	If the voice-port dial type is pulse, configure the pulse timing values:
	router(config-voiceport)# timing pulse digit milliseconds	Configure the pulse digit signal duration. The range of the pulse digit signal duration is from 10-20. The default is 20.
	router(config-voiceport)# timing pulse inter-digit milliseconds	Configure the pulse inter-digit signal duration. The range of the pulse inter-digit signal duration is from 100-1000. The default is 500.
8	router(config-voiceport)# vad	Enable Voice Activity Detection (VAD) on the voice-port. By default, VAD is disabled.
9	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 bit patterns sent or received by the Cisco MC3810 to match expected patterns on 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.

To configure tuning options for specific voice signaling types, refer to the following sections in this chapter:

Step	Command	Purpose
1	router(config-voiceport)# impedance {600r|600c|900r|900c}	Configure the impedance for the FXO port (analog voice ports only). The default is 600r, for 600 ohms real.
2	router(config-voiceport)# ring number number	Configure the number of rings detected before a connection is closed on the FXO port.
3	router(config-voiceport)# timing guard-out milliseconds	Configure the timer that will prevent a new seizure from this FXO port to a remote FXS port so that the FXS port can clearly detect the disconnect signal. The valid range for the duration is from 300-3000, and the default is 2000. It is recommended that this value be set to 600  milliseconds or more.
4	router(config-voiceport)# exit	Exit voice-port configuration mode.

Step	Command	Purpose
1	Configure the ring characteristics of an FXS voice port (analog ports only):
	router(config-voiceport)# ring frequency number	Specify the ring frequency for the FXS voice port. The number value should be set to either 20 or 30.
	router(config-voiceport)# ring cadence [on1 | off1] [on2 | off2] [on3 | off3] [on4 | off4] [on5 | off5] [on6 | off6]	Specify the local ring cadence for the FXS voice port. Using this command, you specify the on and off pulses for the ring. The ring cadence that should be configured differs depending on the local region. The values are measured in 100-millisecond units. The default is on2 and off4, which is the default ring cadence for North America.
2	router(config-voiceport)# disconnect-ack	Configure the voice port to disable the sending power as an acknowledgement to the FXS after a detected on-hook signal in the connected state.
3	router(config-voiceport)# exit	Exit voice-port configuration mode.

Step	Command	Purpose
1	router(config-voiceport)# operation {2-wire | 4-wire}	Configure the E&M cabling scheme (for analog voice ports only).
2	router(config-voiceport)# type {1|2|3|5}	Configure the E&M interface type.
3	router(config-voiceport)# timing wink-duration milliseconds	Configure the timing wink-duration value. This value sets the wink signal duration for a wink-start signal. This value applies only if the signal command is set to wink-start. The range is from 100-400 and the default is 200.
4	router(config-voiceport)# timing wink-wait milliseconds	Configure the timing wink-wait value. This value sets the wink wait duration for a wink-start signal. This value applies only if the signal command is set to wink-start. The range is from 100-5000 and the default is 200.
5	router(config-voiceport)# timing clear-wait milliseconds	Configure the timing clear-wait value. This value sets the amount of time between the inactive seizure signal and the call being cleared. The range is from 100-2000 and the default is 400.
6	router(config-voiceport)# timing delay-duration milliseconds	Configure the timing delay-duration value. This value sets the delay signal duration for delay dial signaling. This value applies only if the signal command is set to delay-dial. The range is from 100-5000, and the default is 140.
7	router(config-voiceport)# timing delay-start milliseconds	Configure the timing delay-start value. This value sets the delay interval between the generation of the delay-start signal from incoming detection seizure. This value applies only if the signal command is set to delay-dial. The range is from 20-2000 and the default is 150.
8	router(config-voiceport)# timing dialout-delay milliseconds	Configure the timing dialout-delay value. This value sets the delay interval before sending a dial digit or cut-through. This value applies only if the signal command is set to immediate. The range is from 100-5000, and the default is 300.
9	router(config-voiceport)# exit	Exit voice-port configuration mode.