240 Reference
VERIFYING CO DISCONNECT SIGNALS
The VS1 telephone system requires Loop Start CO lines with cutoff on disconnect (COD) or
disconnect supervision for proper operation. A Disconnect Signal is simply a 500 to 900 millisecond
(ms) drop in loop current provided by the telephone company to signal the end of the current call.
The VS1 phone system relies on these Disconnect Signals to properly terminate CO calls that are
connected to voice channels (i.e. Auto Attendants, Voice Mail, and ACDs).
If you suspect the local telephone company is not providing disconnect signaling, follow these steps
to verify the CO Disconnect Signal:
Note This test should be performed while system activity is at a minimum.
1. In the System Configuration 1 window, type 999 in the Default Disconnect (.01 sec) text box.
This change is required to properly perform the disconnect test.
2. Verify that the Disconnect parameter is set to –1 in every analog (non-T1) CO Port
Configuration edit window.
3. Restart the phone system.
4. At the Telecor Voice Server (TVS) Command prompt type set debug=7 and press
ENTER.
Next, type set errorlog=error.log and press
ENTER.
Note If you are performing this test on a Telecor Voice Server Model 200 (PV-CSU-200),
connect to the system through the Tel-Site system management application and issue the
commands from the Terminal window.
5. Have an assistant place an inbound call on one of the CO lines. Answer the call from a station
set. When you are connected to the outside caller, instruct them to hang up.
• Important: Do not hang up your station set for 15 seconds.
6. At the TVS Command prompt type clear [port #] using the port number that the call
rang in on, and press
ENTER. This releases the call if the phone system hasn’t disconnected
already.
7. Repeat steps 5 and 6 at least four times.
8. In the System Config 1 pane set the Default Disconnect back to 40, and then reset the system
to put this change into effect.
9. At the TVS Command prompt type copy error.log a:error.log to copy the file
error.log from the c:\ops directory to a disk in the a: drive. If you are connected to the
system through Tel-Site, use the Explorer window to download error.log to your local
system.
10. Open the error.log file in a text editor such as DOS Edit or Notepad. Search for lines of
text that contain the words “CO:Flash” (i.e. CO:Flash 820 mS[1]) and make note of the values
immediately after the word “Flash”.
• These values are the length of the disconnect signals that the phone system recorded on the
CO port.
To Next Page
Loading...