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Table 7-2. Voice/Fax Troubleshooting Guide
Condition Possible Cause Corrective Action
Volume levels not 1. Input level gain setting too 1. Increase input level gain setting on sufficient on local low
on remote voice/fax remote voice/fax channel a couple voice/fax channel channel. db and
recheck voice quality, refer to the V(1/2)IL command in
Chapter 5.
2. Output level attentuation 2. Decrease output level attenuation setting too
high on local setting on local voice/fax channel a voice/fax channel. couple db and
recheck voice quality, refer to V(1/2)OL
command in Chapter 5.
Local telephone goes 1. Devices not connected to 1. Verify that the devices are attached off-hook and remote
correct voice/fax channel. to the correct voice/fax channel Telephone does not
RJ-11 connector.
ring. FXS to FXS
Configuration 2. Voice/fax channel 1. Verify that each voice/fax channel configuration
problem. is configured correctly (FXS,FXO, or E&M), destination
channel and node and composite link.
2. Observe that the XSG LED on the
local voice/fax channel lights when the telephone goes off-hook and
that the RSG LED on the remote FXS configured voice/fax channel
flashes with each ring.
Data throughput slows 1. Too much bandwidth being 1. Decrease voice/fax channel excessively when one
used up for voice/fax. digitizing rate to 9600 bps, refer to or both voice/fax V(1/2)DR
command in Chapter 5.
channels are active.
2. Enable, or if active, increase silence
suppression on one or both voice/ fax channels, refer to V(1/2)SS
command in Chapter 5.
FXS to FXO 1. Device not connected to 1. Verify that the device is attached to
configuration - Local correct voice/fax channel. the correct voice/fax channel telephone does not ring
RJ-11 connector.
2. Voice/fax channel 1. Verify that the voice/fax channels
configuration problem. are configured correctly (destination
node and channel and composite
link).
2. Verify that local voice/fax interface
type is configured for FXS and remote interface type is set for
FXO operation, refer to the VL
command in Chapter 5.
Table 7-2. Voice/Fax Troubleshooting Guide (Continued)
Condition Possible Cause Corrective Action
FXS to FXO 3. Change the local or remote configuration - Local
configuration as needed using the telephone does not ring V(1/2)LI or
V(1/2)RI command, (Continued) refer to Chapter 5.
Parts of words not 1. Part of analog signal 1. Lower the input level gain and the
being heard being clipped off. output level attentuation a couple of
db using the V(1/2)IL and V(1/2)OL commands. Refer to
these commands in Chapter 5.
Voice conversation or 1. Remote connection is 1. Verify the remote interface type at
fax traffic become different than remote the site that was just changed
erratic after changing interface type. using the VL command. Refer to
the remote interface type Chapter 5.
2. Contact the remote site to verify its
local interface type and change accordingly using the V(1/2)RI
command. Refer to Chapter 5.
No communication on 1. Composite link down. 1. Call phone company and verify either voice/fax channel
communication line.
2. Phone cords for the voice 1. Verify that the phone cords for the
and/or fax machine are voice and/or fax machine are either
connected to the connected to the correct channel wrong channel or interface. and/or