NEC 128/384 manual When placing a call, the line immediately hangs up

VisuaLink 128/384 User Guide		Chapter 9
Area	Condition	Check Item and Countermeasures
		[When placing a call, the line immediately hangs up]
		∙ Make sure the network is connected.?
		∙ The line could be busy. Please try later.
		∙ Verify the line conditioning setting match that for the VL.
		[Line disconnects a few seconds/minutes after placing a call]
		∙ The line could be busy. Please try later.
		∙ Remote equipment could be turned OFF.
		∙ Verify the number called.
	Unable to connect to a	[The line is disconnects during communication]
		∙ Failure could have occurred on the line, which has caused the line to
	remote site	disconnect. Please try connecting again.
		[Voice and picture are not received after connecting]
		∙ A line failure has occurred. Please disconnect and replace the call.
Network		∙ A communication protocol failure with the remote address has occurred.
		Please disconnect, power OFF and ON the equipment to clear the
		status. Please try connecting again after the status has cleared.
		[There are random errors with the voice and picture]
		∙ If a line error or a equipment failure occurs during communication, noise
		in audio and/or error in picture may occur. Please disconnect once and
		reconnect.
		[ISDN is not present]
		∙ Check the ISDN line connection. The VisuaLink has a S/T interface and
	If after everytime you try to	requires an NT12 to be connected between the VisuaLink and your ISDN
		line unless the VisuaLink is connected to a PBX.
	dial a call, the system
		∙ Make sure the ISDN cable to the system is securely attached.
	immediately ask you to
	redial	∙ SPID and/or ISDN number entered incorrect
		∙ Check the Local Line setting
		∙ Run a Local Line loopback from the maintenance settings.
	If you can make calls to	[ISDN provisioning]
	some sites but not others.	∙ Need to confirm ISDN provision from the Teleco.

NDA-24230 Issue 2.0 Page 9-3