Cisco Cisco IOS Software Release 12.3(11)T
IP Communications Voice/Fax Network Module
Configuration Example for IP Communications Voice/Fax Network Module
17
Cisco IOS Release 12.3(11)T2
Troubleshooting Tips
In some rare instances, if you have installed the VIC2-2FXO or the VIC2-4FXO and configured the voice
port for groundstart signaling, you may have difficulty connecting some outgoing calls. The problem
relates to the FXO groundstart voice port failing to detect a tip-ground acknowledgment, resulting in an
unsuccessful call setup.
port for groundstart signaling, you may have difficulty connecting some outgoing calls. The problem
relates to the FXO groundstart voice port failing to detect a tip-ground acknowledgment, resulting in an
unsuccessful call setup.
If you encounter this problem, upgrade your Cisco IOS software image to the latest version (for example,
if you have Release 12.3(11)T installed, upgrade to Release 12.3(11)T2). This should fix the problem.
if you have Release 12.3(11)T installed, upgrade to Release 12.3(11)T2). This should fix the problem.
If this problem still occurs, you must enable the groundstart auto-tip command in the configuration of
the FXO voice port. When you are placing outgoing calls, this ensures that the circuit detects a
tip-ground acknowledgment from the far end and completes the connection within the time-out
parameter. For information about the groundstart auto-tip command, refer to the
the FXO voice port. When you are placing outgoing calls, this ensures that the circuit detects a
tip-ground acknowledgment from the far end and completes the connection within the time-out
parameter. For information about the groundstart auto-tip command, refer to the
For more information about this problem and more comprehensive troubleshooting steps, use the
reference provided in the
reference provided in the
. You can search the website using
keywords groundstart, analog, and fxo to obtain information on the topic described here.
Configuration Example for IP Communications Voice/Fax
Network Module
Network Module
This section provides a configuration example for the following:
•
Channel Bank Support: Example
This section provides an example of partial output from the show command after channel bank support
has been configured:
has been configured:
Router# show startup-config
!
voice-card 1
!
voice-card 2
!
voice-card 4
!
!
controller T1 1/0
framing esf
linecode b8zs
ds0-group 1 timeslots 1 type e&m-wink-start
!
controller T1 2/0
framing esf
linecode b8zs
ds0-group 1 timeslots 1 type fxs-loop-start
!
controller T1 4/0
framing esf
linecode b8zs
ds0-group 1 timeslots 1 type fxo-loop-start