Polycom VSX Series manual Codes on page Appendix-11

Diagnostics and General Troubleshooting

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
(H.230) call.	line.
		Codes on page Appendix-11.
	The highest-numbered	Be sure you are calling the correct number. The
	channel did not connect.	number 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 not	Check the ISDN configuration and verify with your
	configured correctly on the	ISDN service provider that the system is configured
	VSX system.	correctly.
	The network interface	Check the cables to the network interface module.
	module is not connected
	properly.
The PBX does not accept	The PRI network interface	Verify that you have configured the system’s PRI
calls of type “unknown”	is not configured correctly.	network interface correctly. For detailed instructions,
from the PRI network		see Configuring the PRI Network Interface on page
interface module.		3-21.
ISDN Calls do not connect	Not all the ISDN B channels	Set the number of lines to be dialed to a lower
at the requested data rate.	connect.	number. For more information on specifying the
		number of lines, refer to Configuring the BRI Network
		Interface on page 3-19.privacy shutter
A system using a	V.35/RS-449/RS-530	Call the far site, or have the caller try again at a
V.35/RS-449/RS-530	systems cannot determine	different call speed.
interface cannot receive	how to allocate bandwidth
calls at certain speeds.	for call speeds that are
	divisible by both 56 and 64
	(such as 448K: 8 x 56K), so
	the call cannot be
	connected correctly.

7 - 15