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Which means what? You have a solid red light on the line or you don't have the line at all. A TDA system rings by a process called ICD groups. You can have a phone in an ICD (600 by default) and tell it the number of rings to delay, not ring, or immediate ring, but that means that the line button will flash as the call is coming in. If you don't assign it to a group, it's really stupid and won't do anything but light solid red.
If you have access to installer programming, you assign the extension to the main ICD. If you don't you have to call your Panasonic installer or dealer.
The ringtone for the CO or outside line buttons can be programmed by pressing program then press the
CO button twice, enter the ringtone you want by dialing 01 to 08, press enter or store then program to end. This will set the ringtone for that line assuming it is programmed to ring at that phone. Transferred calls will use the ringtone of the intercom button which can be set by the same procedure. Use the same procedure if calls ring to a Group Directory Number(GDN) on the phone. The 7600 series of digital phones have ringtone settings of 01 through 30.
When you bought the phone system, it was either installed by a professional installer, or you got some sort of instructions. A Panasonic phone system of the TDA/TDE/NCP type rings phones by Incoming Call Distribution Groups (ICD). The main group is 1 and usually is numbered 601. Extensions are members of an ICD group(s) and the number of rings can be programmed for No Ring, Immediate ring, or delayed rings of 1-6.
You can turn off the ringing, but keep in mind that CallerID only displays on a ringing phone or after you answer it. So, if you somehow have access to program 620 and 621, then you can change it from a phone, if not, you'll need access to the maintenance console of your particular phone system.
I don't wish navigating in 620/621 from a phone on my worst enemy and it's beyond the scope of a free forum to instruct you on how it works. I suggest you call your Panasonic service tech.
The programs involved with you ringing are 81 ( no light or Day Mode ), 84 ( blinking red light or Day 2 Mode ), and 87 ( solid red light or Night Mode ). To change the ringing assignments you need to know the port numbers of the phones you want to ring or not ring. You can do this by pressing DN/ICM dialing # 4 0 2 at each phone, the diaplay will show the physical and logical port numbers. These numbers will be used to turn on or off the aaociated lamps within the above programs. Do you have anyone on staff that understands the system programming ? Let me know ...Mike