Incoming call problems

General
1

Often when I receive a call on my home phones, I get a loud rush of noise when I pickup, and I can’t hear the caller. The caller, just hears the ring tone untill my voicemail kicks in. I’ve missed many calls because of this. I have a GrandStream 802 and panasonic cordless phones. I have discussed this with both grandstream and VOIP.ms to no avail. The GrandStream has the latest firmware and is reset weekly. This has been going on ever since I switched to voip.ms a few years ago.

2

can you post your settings so people can help?

3

Hello @jidlar,

I have the same setup (GrandStream HT802 + Panasonic DECT cordless phones) and ran into this problem too.

The issue is with the Panasonic DECT handsets/base, not the GrandStream.
When an incoming call arrives, the DECT system randomly picks a channel for the base-to-handset link. Depending on which channel it lands on (and how much RF interference is present on that channel), you get anything from clean audio to a loud rush of noise/static. In the bad cases, the off-hook signal either doesn’t register properly or the audio path is so corrupted that the call never fully answers on the SIP side, so the caller just keeps hearing ringing until voicemail picks up.

It took me a long time to figure this out. Since then I’ve mostly switched to my smartphone running Groundwire (or any good SIP client) and have zero issues. When I occasionally use the old Panasonic (the batteries have been replaced once, so it’s showing its age), I never know if I will get the static, but I got it far less often than before — probably because I use it far less too.

I also have an old wired “touch-tone” analog phone plugged into the HT802 and have never heard the noise on it.

With a quick search I found the following suggestions that could reduce the problem:

  • Move the DECT base station as far as possible from your Wi-Fi router, modem, computers, or any other 2.4 GHz/5 GHz devices.

  • Try a different power outlet for the base (sometimes electrical noise helps trigger it).

  • If your Panasonic model allows it, force a different DECT channel or enable any “noise reduction”/“interference reduction” settings in the handset menu.

Kind regards!

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