No ring when someone tries to connect

Google

make model manual

CTRL+F, type 'mute', 'silence', 'ringer' or 'volume', press Enter.

https://www.google.com/search?q=idect+phone+not+ringing

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You will probably have to call your phone provider and request the number be blocked, that's the only surfire way.

check your phone is on silence so just return it back to general and your phone will start ringing out

Ringer turned on? quite common and I'm a phone repair man. Does the calling party hear multiple rings? If it rings only once and goes to silence on the calling party end, there is a high resistance short on the line and it must be repaired.

Looks like the basic functions of the phone are correct. Remain the answering machine. Are you sure it can act as an answering machine?
If it can act as answering machine the reason it is not doing so may be the following.

1. Answering function is turned OFF
2. Answering function may be ON but the number of rings before it answers is set too high.

I suggest you try the following
Call you phone. Let it ring at least 10 times. If it can act as an answering machine it will pick up the phone and read the welcome message, because most answering machines (the recent ones at least) answer after 10 rings even if answering function is turned OFF.

The phones that can be answering machines usually do have a display that shows the number of incoming messages, or a LED that flashes to let you know that you have new recorded messages.

wen i receive incoming calls there is no ring or message alert

I just bought a new Uniden DECT 6.0 phone and had a similar problem. It wouldn't ring when plugged into my Linksys voip router, but my old 5.8 GHz did ring. It would get a dialtone and make calls, but when called via an outside line, it would appear as if it was ringing. If I picked up during this "silent ring," it would answer and take the call. It wasn't a ringer volume issue. I called tech support, they said on the main headset, unplug the battery, then unplug power from the base, then unplug the phone cord from the base. Wait 15-30s. Plug the phone cord, then power, then reinstall the battery. Press the End button on the phone. Put the phone on the base for 15-30s. Pick up the phone. Press and hold the Find button on the base. Do this Find thing 3 times. Put the phone back on the base. Wait 10-15 minutes. Then try calling it to see if it rings. Worked for me, finally got it to ring before I decided to return it.

Your Handset has been programmed i guess by mistake to be in the same ring group as the main receptionist for C0-01 . Use Google for programming manual to make changes.

www.heymot.co.uk

I need to know more details,
Can you tell me whether you have lotsa messages in your phone?

have you called the support line for assistance?dial 1.800.511.3180