How can I prevent an echo on the IP-SoftPhone?

How is the Echo:

Actually, we are used to hearing something while making a phone call. That is why we have already seen users blowing into the handset's microphone on rotary dial telephones in order to determine whether this sound is also being reproduced in the earpiece. If this " Crosstalk "takes place in real time, one perceives it as pleasant. Since VoIP does not take place 100 % in real time, one perceives it as an Echo. due to the delay due to the technology. High quality headsets calculate this audio stream out and thus remove the unpleasant Echo.

Why does the Headset- telephony even reproduce the echo:

It is actually the case that the spoken word of your counterpart is reproduced so loudly in the headphones that it is picked up again by the microphone via the air or via the microphone boom and is therefore audible again.

How can you improve it:

Crosstalk

You have to reduce the playback volume a little and turn the microphone sensitivity down so that the crosstalk is no longer audible, but you can still make phone calls comfortably.

The left bar controls the microphone sensitivity, the right the playback volume

Delay

A delay arises when the internet connection is not good or the computer has problems providing the necessary performance. . Therefore, you should check the internet connection and if possible not use WiFi but rather a wired connection to close automatically starting applications and only to run the IP-SoftPhone for a phone call. If it then works without an echo, you should gradually start the applications of daily use and observe when the echo / delay occurs again.

If all else fails, it might help to restrict the selection of codecs (only check G711a and G711u) or to prioritize the connection to your PC in your FRITZ! Box https://avm.de/service/wissensdatenbank/dok/FRITZ-Box-7490/228_Internetzugang-fur-wichtige-Netzwerkgerate-und-anwendungen-priorisieren/

Limitation of the audio codecs