In the ZIAD PHD Telecommunicator, I find five oddball symbols:

*****
** **
***
*****
*****

This is supposed to indicate a Phone ON HOOK (The top two rows are the handset, the bottom two rows are the base and the middle row is the switch hook. I know. Use your imagination)

*****
* *

* *
***
*****
*****

That is a phone OFF HOOK (handset, switch hook and base again).

***
* *
***

** **
* *
*

This last character is for ZERO VOLTS (The top half of the figure is a 0, the bottom is the letter V. It indicates a dead line, the test leads not connected to anything etc.

***
* *
* *
* *
** **

This is a LONG PULSE INTERVAL. Could be caused by a hook flash or an on-hook in the middle of a dial string.


*
* *
* * *
* *
*
This is supposed to look like an infinity sign and is an IN BAND TONE INDICATOR. Caused by non-dtmf tones (300-3000 hz) on the line for at least 500ms at a level of at least -24db.

Hope this helps.

Sam

"Where are we going and why are we in this hand basket?"