Interlocutor has strong hall effect

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All the same whom I call whether fixed net or mobile phone, my interlocutor has a strong resounds and hears its own voice continuously….
Use X-Lite and load degrees of SIPPS down. Perhaps that changes it, does not believe however.
Web.de Freephone does not funzt at all correctly. Jerk ELT without end and one can understand nix. The “key clay/tone” with jerk ELT already select totally, habs thus again of the Festpladde geschmissen.
Perhaps does one know, how one to these resound away-gotten?
Otherwise Internet Telephonie is not worthwhile itself genuinly for me.
Thank you!
Paul

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Simplest solution, your loudspeakers are too loud and/or. your microphone is too sensiebel. In addition, hereby I have this problem into the grasp never got completely, stopped it only with a hardware solution.