Echoes with T32G phones

[JasonHayes]

We are getting the same with T22 Phones. We run 3CX and had no issues then over night, normally during a call we get an echo. It is so off putting we have had to end some calls. Yealkink any ideas? I have tried the latest version of the firmware and it makes no difference. It is not every call and normally happens during.

Below is our 3CX Yealink Procisioning Template.
#Enable or disable the voice activity detection feature; 0-Disbaled (default), 1-Enabled;
voice.vad = 0

#Enable or disable the comfortable noise generator; 0-Disabled, 1-Enabled (default);
voice.cng = 1

#Enable or disable the echo canceller; 0-Disabled, 1-Enabled (default);
voice.echo_cancellation = 1

#Configure the volume of the side tone. It ranges from -48 to 0, the default value is -3.
voice.side_tone= -3

#Configure the sending volume of Speaker, Handset and Headset. It ranges from 1 to 53, the default values are 25, 35, 30.
#Require reboot;
voice.handfree_send = 25
voice.handset_send = 35
voice.headset_send = 30

#Configure the type of jitter buffer; 0-Fixed, 1-Adaptive (default);
voice.jib.adaptive = 1

#Configure the minimum delay, maximum delay and normal delay. The default values are 0, 300, 120.
voice.jib.min = 0
voice.jib.max = 300
voice.jib.normal = 120

#Define the voice tone, the valid values can be Custom (default) or voice tone of different countries. For example, United States, France, Germany and so on.
#voice.tone.country = Custom
voice.tone.country =

#Configure the receiving volume of Speaker, Handset and Headset. It ranges from 0 to 15, the default value is 8.
voice.handfree.spk_vol =
voice.handset.spk_vol =
voice.headset.spk_vol =

#Configure the dial tone volume of Speaker, Handset and Headset. It ranges from 0 to 15, the default value is 8.
voice.handfree.tone_vol =
voice.handset.tone_vol =
voice.headset.tone_vol =

#configure the preview call mode; 1-Ignore:the mixed of tone and RTP (default), 2-Force: discard the RTP and play the tone, 3-Skip: skip the tone to play the RTP;
voice.call_preview_mode=