wrote:
English (google assisted translation):

Hey,

My phone does not work well according to my family.

(Old wire telephone connected to cable modem for internet and VOICE over IP.)

They're trying to call me. The phone does ring on their side.

But the phone does not ring on my side.

This has now occurred twice.

The crazy thing is now as follows:

1. I now have two phones

The black and the green, both do well during testing. Although the black is slightly crooked and old. The green is a bit newer and on the other hand they hear me better.

2. I had rolled up the telephone cord to make a knot.

That rather large bun could act as a kind of coil, and can cause electromagnetic effects?!?

That is actually what my question is about?!? Could it be that an electromagnetic coil along a telephone line in one way or another causes a problem with the ringing of the telephone?!?

The analog POTS phone plugged into the RJ11 jack on the
cable modem/router/VOIP box, works at 4KHz for the audio.
For the ringing tone, that could operate at 20Hz. The 20Hz
was selected for "resonance" with older mechanical bell ringers.

These frequencies would be transparent to the coiled up phone line.

There should be no effect.


The most simple problem could be if the black telephone
occasionally has a defective bell or something.

Last time I put it on "earth" instead of "flash" I do
not know exactly what that means but I assume that that is a tune or something.

This is my main problem with VOIP - too many settings, not
enough explanation of what they do.

HOW WOULD YOU TEST IT?!?!?!?!

Some ISPs have testing information for their customers.
The VOIP system *may* use specific phone numbers to
do testing with. These allow a VOIP user to "call themselves"
with the ability to play back a pre-recorded message.

Here is an example.

https://teamhelp.sipgate.co.uk/hc/en...-Configuration

1) Call 10000 from your VoIP phone.

If 10000 is reachable your phone has successfully registered
online with our systems.

[ That means you get a response in the direction towards the VOIP system. ]

2) Call 10005 to make an echo test call.

This will test your configuration as with 10000 and also the
connection's quality in both directions.

After the call is answered, please follow the prompts to
record a message which will then be replayed to you.

Check your VOIP provider web site and see if they
support "echo test call".

On the echo test call, the phone will ring on your end. When
you pick up the line, the pre-recorded message you left, will
be played to you. If the message is distorted, that may indicate
a problem happened during the preparation of the pre-recorded
message you "uploaded" in a sense. Maybe the microphone on
the POTS phone is in need of repair, if the signal
is distorted. Or perhaps the VOIP circuitry has a problem.

That's an example of "custom line testing" provided by a
VOIP provider. Look for a web page with your provider,
for a *similar* feature. The telephone numbers used
on each custom VOIP system will be different.

*******

When the modem/router/voip box boots up after power failure,
it generates a log output. You can configure the equipment
so that the log is made available to you. This will prove
for example, that the VOIP firmware has made connections
with the ISP and is registered.

*******

The sounds you hear on your end, are an "emulation" of the
telephone system. These are the settings on my VOIP.

System Ring Cadence: c=2000/4000 milliseconds

Call Progress Tones:
Dial Tone: f1=350Hz f2=440Hz c=0/0 "berrrr..."
Ringback Tone:
Busy Tone: f1=480Hz f2=620Hz c=500/500 "berp berp berp"
Reorder Tone:
Confirmation Tone:
Call Waiting Tone:
Prompt Tone:

So everything on the terminal end, in your room,
is created locally. The phone company doesn't actually
send "berp berp berp", but the VOIP box creates the
noise when the VOIP "state machine" is in a particular state.

In a separate menu, are settings for each RJ11 port.
You can have the two phones receive different settings.

Ring Timeout: 60 seconds === incoming call ring duration

You can see a VOIP company offering setup information
to its customers, as in this example. That device has no
ringing setting, other than "System Ring Cadence". You
can't set the ringing frequency (20Hz) or the voltage
(180Vpp) in the settings. The other details might be
covered by the SLIC country setting.

https://weepee.zendesk.com/hc/nl/art...2-configuratie

The VOIP hardware has to do several things:

1) Pass voice samples in the 4KHz band.
Convert packets to voice samples.

2) "Add" synthetic sounds such as the Dial Tone
into the analog output. Dial Tone is locally
generated, and only when the VOIP has "registered itself".

3) Present -48VDC for onhook/offhook detection on
legacy POTS phones. If the threshold is mis-adjusted
on the VOIP end, the VOIP may not recognize you have
picked up the receiver.

You set the SLIC standard, to a particular "country"
Perhaps a Dutch phone uses Germany SLIC setting (several
countries use exactly the same settings).

http://what-when-how.com/voip/countr...terfaces-voip/

"The front-end SLIC of a VoIP adapter is programmed
for required voltages, line conditions, REN drive, impedances,
gain/loss, and diagnostic features."

Rather than have the customer specify each voltage,
the "SLIC country" setting may declare a standard
set of values. If the phone doesn't match the standard,
it may not go off-hook, it may not ring properly, and
so on.

This is an example of a chip that converts low voltage
signals to the high voltages the phone line needs...

https://www.renesas.com/in/en/www/do...et/hc55185.pdf

https://en.wikipedia.org/wiki/Ringing_%28telephony%29

"In landline telephones, bells or ringtones are rung by
impressing a 60 to 105-volt RMS 20-Hertz sine wave across
the tip and ring conductors of the subscriber line, in
series with the (typically) −48 VDC loop supply. This
signal is produced by a ringing generator at the
central office [or locally by the VOIP box!].

4) Generate a 20Hz, 105Vrms ringing signal to trigger
the ringer on the phone. The signal has to be
sufficient to run a 500 set perhaps. There are
standards for "unit loads" which the VOIP hardware
has to meet or match, to operate a telephone in
a consistent fashion.

When I got VOIP, the two week period while I still
had a conventional phone, as well as the VOIP with
a test number, were very profitably spent adjusting
the VOIP settings. However, I *still* got one setting
wrong, which was driving me nuts :-/ I finally figured
out what that setting is, by trial and error. Excessively
long voice mail messages were being left, after a
caller had hung up, but the phone on my end had
not terminated the call.

Paul