Polycom Audio and Video manual On page Appendix-4, Go to Admin Settings Network Call Preference

Administrator’s Guide for the V500 System

Symptom	Problem	Corrective action
Error message occurs	An ISDN cause code is	Try the call again.
when placing an ISDN	received from the ISDN	For more information, please refer to Q.850 Cause Codes
(H.230) call.	line.
		on page Appendix-4.
	The highest-numbered	Be sure you are calling the correct number. The number
	channel did not connect.	may need to include:
	The system cannot make a	• A digit for an outside line
	call if this channel does not
		• A long distance access code
	connect.
		• 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.
	The ISDN switch type is	Check the ISDN configuration and verify with your ISDN
	not configured correctly on	service provider that the system is configured correctly.
	the V500 web interface.
Cannot complete calls to	The system displays a	Your system is configured to require all calls to be
sites that do not use	message stating that	encrypted, and encryption is not available at the far site.
encryption	encryption is required.
Cannot dial remote	Switch protocol issue.	Start by calling the far site at 1x56 and progressively try
system in bonding calls.		higher speeds, as appropriate. This will verify the primary
(The call progress circles		number.
only show blue or yellow.)		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.
Dialing a remote site in	The far site may be unable	Go to the Call Status screen. Highlight the circle for the
calls above some	to accept calls above this	channel dialed. The number dialed for the channel will be
particular speed does not	speed.	displayed as you highlight the circle. Make sure that the far
work. (The call progress		site has entered the number for its ISDN lines correctly.
circles do not turn green,
or remains blue.)
Cannot select the desired	Speeds do not show when	1. Go to Admin Settings > Network > Call Preference
speeds for bonding calls	selecting the speed icon.	and select	four times to go to the Call Speeds
from the speed selection.		screen.
		2. Select the desired call speeds.

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