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New Member

FXO voice-port halted

One of our router is connecting to IP phones via FXO voice-port. The user found that they cannot make a phone several call every months. During the problem, users can only heard busy tone from the phone. Once the user reported, we will enter the following commands to resolve the problem:

router(config)#voice-port 1/0/2


router(config-voiceport)#no shutdown

router(config)#voice-port 1/0/3


router(config-voiceport)#no shutdown

Anyone can help in this case? Is it software bugs for voice-port?

router#sh version

Cisco IOS Software, 2800 Software (C2800NM-ENTSERVICESK9-M), Version 12.4(23), RELEASE SOFTWARE (fc1)

Technical Support:

Copyright (c) 1986-2008 by Cisco Systems, Inc.

Compiled Sat 08-Nov-08 21:57 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)


Cisco 2811 (revision 53.51) with 512000K/12288K bytes of memory.


2 FastEthernet interfaces

2 Serial(sync/async) interfaces

1 ISDN Basic Rate interface

8 Voice FXO interfaces

4 Voice FXS interfaces

DRAM configuration is 64 bits wide with parity enabled.

239K bytes of non-volatile configuration memory.

255488K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102

Hall of Fame Super Gold

Re: FXO voice-port halted

Possibly you need to configure disconnect supervision.

New Member

Re: FXO voice-port halted

Hi p.bevilacqua,

Already configured disconnect supervision and here is the config:

voice-port 1/0/1

supervisory disconnect anytone

cptone CN

timeouts interdigit 3

timeouts call-disconnect 3

timeouts wait-release 3


During the problem, I found the following show voice-port result:

Foreign Exchange Office 1/0/1 Slot is 1, Sub-unit is 0, Port is 1

Type of VoicePort is FXO

Operation State is UP

Administrative State is UP

The Last Interface Down Failure Cause is Administrative Shutdown

Description is not set

Noise Regeneration is enabled

Non Linear Processing is enabled

Non Linear Mute is disabled

Non Linear Threshold is -21 dB

Music On Hold Threshold is Set to -38 dBm

In Gain is Set to 0 dB

Out Attenuation is Set to 3 dB

Echo Cancellation is enabled

Echo Cancellation NLP mute is disabled

Echo Cancellation NLP threshold is -21 dB

Echo Cancel Coverage is set to 64 ms

Echo Cancel worst case ERL is set to 6 dB

Playout-delay Mode is set to adaptive

Playout-delay Nominal is set to 60 ms

Playout-delay Maximum is set to 250 ms

Playout-delay Minimum mode is set to default, value 40 ms

Playout-delay Fax is set to 300 ms

Connection Mode is normal

Connection Number is not set

Initial Time Out is set to 10 s

Interdigit Time Out is set to 3 s

Call Disconnect Time Out is set to 3 s

Ringing Time Out is set to 180 s

Wait Release Time Out is set to 3 s

Companding Type is u-law

Region Tone is set for CN

Analog Info Follows:

Currently processing Voice

Maintenance Mode Set to None (not in mtc mode)

Number of signaling protocol errors are 0

Impedance is set to 600r Ohm

Station name None, Station number None

Translation profile (Incoming):

Translation profile (Outgoing):

Voice card specific Info Follows:

Signal Type is loopStart

Battery-Reversal is enabled

Number Of Rings is set to 1

Supervisory Disconnect is anytone

Answer Supervision is inactive

Hook Status is Off Hook

Ring Detect Status is inactive

Ring Ground Status is inactive

Tip Ground Status is inactive

Dial Out Type is dtmf

Digit Duration Timing is set to 100 ms

InterDigit Duration Timing is set to 100 ms

Pulse Rate Timing is set to 10 pulses/second

InterDigit Pulse Duration Timing is set to 750 ms

Percent Break of Pulse is 65 percent

GuardOut timer is 2000 ms

Minimum ring duration timer is 125 ms

Hookflash-in Timing is set to 600 ms

Hookflash-out Timing is set to 400 ms

Supervisory Disconnect Timing (loopStart only) is set to 350 ms

OPX Ring Wait Timing is set to 6000 ms

I am not sure why the "Hook Status" is staying in Off Hook when the call is already closed. Also, why "supervisory disconnect anytone" cannot solve this problem? I need to enter shutdown/no shutdown everytime to reset the voice-port to solve the problem.

Hall of Fame Super Gold

Re: FXO voice-port halted

You need to configure the specific tones.

Anynote never works.

New Member

Re: FXO voice-port halted

Hi p.bevilacqua,

Thanks. But would you please explain me why "anytone" doesn't work? Also, in my case, what tones should I use?

Hall of Fame Super Gold

Re: FXO voice-port halted