Typically this is only an issue when using a wireless phone in place of a landline or when an Optelator is installed. If you have this issue with a standard landline then the line may be at fault, however, this adjustment might work around the problem.
Some devices generate a square-wave ring signal on an incoming call instead of the sine-wave ring voltage that is found on a normal telephone line. A ring sensitivity adjustment can be made in the RFC-1 firmware that will enable it to recognize the non-standard ring signal.
This procedure assumes that the RFC-1/B hardware and any necessary external devices are fully functional and that they have not been hit by lightning or otherwise damaged.
Ring Sensitivity Adjustment
The RFC-1 has a firmware ring sensitivity adjustment that will enable it to recognize the non-standard ring signal of a cell phone. Program the value from column V1 at memory address 1014 to adjust the ring sensitivity. Typically only the even values are appropriate. We suggest a value of V1=8 when using an RJ-11 adapter or when using an Optelator.
Be careful when selecting a value--the list is not in numerical order.
Programming Instructions To adjustment the ring sensitivity in the RFC-1/B: You will need the advanced programming security code for your RFC-1 system. The factory setting is 4150.
V1
Ring Sensitivity
Dedicated Control Port
8
10 (maximum sensitivity)
off
10
4.66
off
12
3.04
off
14
2.25
off
0
1.79
off
2
1.48
off
4
1.27
off
6
1.11 (minimum sensitivity)
off
values below this line are rarely used
9
10 (maximum sensitivity)
on
11
4.66
on
13
3.04
on
15
2.25
on
1
1.79
on
3
1.48
on
5
1.27
on
7
1.11 (minimum sensitivity)
on
