I have DECT phones directly connected to the Swisscom Internet box 2 as well as two IP phones that support HD voice. All phones when on a call, using the handset (not speakerphone) suffer from voice echo, specifically I hear my own voice very quiet about a milisecond after speaking. I have tried to turn down the volume which does not resolve the issue. The DECT phones are all Siemens gigaset devices of different models, all have the latest firmware as does the Swisscom internet box. My IP phones are Granstream GXP2170 and GXV3275. I have tested changing the TX/RX attenuation parameters on the IP phones but this does not resolve the issue. Any similar experiences or possible solutions? Thank you.
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