There are 3 devices. Work with freepbx. It is incomprehensible to behave on the speakerphone. feeling that echo cancellation does not work immediately, or works too well at first. At first, a person talking on this phone can be heard either quietly or intermittently. Especially if you answer him when he says something. But it takes 5-10 seconds of torment - and everything starts to work fine. codecs are left only necessary. echodaw and turned on and off and set up all sorts of branded options. Does not help. Until we figured out what's going on. There are cheaper t21p in the office - they don't have such problems at all.
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