On Apr 4, 3:47 pm, larry wrote:
gary wrote:
The telephone circuit in my home has two phone jacks:

Jack #1 serves a Panasonic KX-TG5210 5.8 GHz Cordless Phone and a hard-
wire AT&T Trimline phone.

Jack #2 serves a hard-wired AT&T Trimline phone.

When an incoming call arrives:

only one phone rings
or only two phones ring.
or the loudness of the ringing varies from phone to phone.

How do I get all phones to ring and to ring loudly?

Look at the bottom of each device for the REN, add all the
rens for line 1 and for line 2.
The phone office has a max REN load of 5.0, other sources
may lower, 3.0 or even 1.0 .

If you exceed the max allowed, some or all devices won't
ring or work. Disconnect a few to get under the max limit,
generally turning the ringer "off" does not change the load.

1 Ringer Equivalent Number is the equivalent load of the
standard single line 1960's desk telephone (model 500 or 2500).

-- larry/dallas

Line 1 (Jack #1):
Panasonic Cordless Phone: .1B
AT&T Trimline phone: .4A and .7B HAC

Line 2 (Jack #2):
AT&T Trimline phone: .4A and .7B HAC

(Both Trimline phones are about 8 years old; the Panasonic Cordless is
about 3 years old).