Polycom V500 System Administrator's Manual page 100

Administrator's Guide for the V500 System
Symptom
Error message occurs
when placing an ISDN
(H.230) call.
Cannot complete calls to
sites that do not use
encryption
Cannot dial remote system
in bonding calls. (The call
progress circles only show
blue or yellow.)
Dialing a remote site in
calls above some particular
speed does not work. (The
call progress circles do not
turn green, or remain blue.)
Cannot select the desired
speeds for bonding calls
from the speed selection.
7 - 12
Problem
An ISDN cause code is
received from the ISDN
line.
The highest-numbered
channel did not connect.
The system cannot make a
call if this channel does not
connect.
The ISDN switch type is not
configured correctly on the
V500 system.
The system displays a
message stating that
encryption is required.
Switch protocol issue.
The far site may be unable
to accept calls above this
speed.
Speeds do not show when
selecting the speed icon.
Corrective action
Try the call again.
For more information, please refer to
Codes on page Appendix-5.
Be sure you are calling the correct number. The
number may need to include:
• A digit for an outside line
• A long distance access code
• An international access code
• A country code
• An area code or city code
Check that all network cables are properly
connected.
Power off the system, wait five seconds, and power
on the system. Then wait about two minutes to allow
the ISDN lines to resynchronize.
Ask the person at the far site to call your system.
Check the ISDN configuration and verify with your
ISDN service provider that the system is configured
correctly.
Your system is configured to require all calls to be
encrypted, and encryption is not available at the far
site.
Start by calling the far site at 1x56 and progressively
try higher speeds, as appropriate. This will verify the
primary number.
Being able to dial non-bonded but unable to dial
bonded to all locations is usually a switch protocol
issue. Verify your ISDN provisioning with the
telephone service provider.
Go to the Call Status screen. Highlight the circle for
the channel dialed. The number dialed for the
channel will be displayed as you highlight the circle.
Make sure that the far site has entered the number
for its ISDN lines correctly.
1. Go to Admin Settings > Network > Call
Preference and select
the Call Speeds screen.
2. Select the desired call speeds.
Q.850 Cause
four times to go to