Alcatel Unleashed

I did a PBX project alongside with my supplier and it's a suite hotel. They are using all NDDI2 cards for their CO trunks with line reversal. And there's stupid ghost calls that often rings back the operator which is as programmed in the Attendant group call distribution.

I even checked the following things before troubleshooting the problem:-
1) Line reversal polarity
2) Trunk group and trunk settings
3) Entity
4) Physical wiring and KRONE tacks

The problem stays on for days and every time I got to pull out the NDDI2 card and plugging them back or even restart the system to make the ghost calls away. I knew the ghost calls is actually a call done by the system. After 3-4 days of thorough checking, my colleague found that there's a stupid setting which the Alcatel default settings differed versus the R5.1.2
The setting was under:-
system > other system parameters > review/modify
No detect.of On-hook tone : True (change it to false)

Many engineers in my country were unaware of such settings as most of the system used by customers were mostly R5 and R6. Just a note to you guys, better be careful of such settings, you may never know when you gonna need it. Hope this is helpful to you guys.

This setting was even found to be different

Do you use in your system analog set (like Panasonic) with 600 mc Flash?

I'm not so sure about the phone set. But I suspected that there's some Panasonic model KX-TS500 if not mistaken.

And also before the customer actually using this system, they were running Panasonic KX-TDA600 with an expansion shelf of KX-TDA620. Though the hotel is not running at it's suit full capacity.

Do you mean that those Panasonic phones flash timers are different and causing such a problem ? After turning off that setting which I mentioned, it works like charm and there's no ghost calls to the operator.