Subject: EXPAND 80+ 3CX
From: "Sara Aknooni (SRAK)" <[email-masked]>
To: "Christopher Kurek (CKUR)" <[email-masked]>, "Matthew Broadley (MAEY)" <[email-masked]>, "Muhammad Ali (MUAI)" <[email-masked]>, "Innocent Bohui (INBO)" <[email-masked]>, "Temistocles Valdes (TEVL)" <[email-masked]>, "Morris Frost (MOFT)" <[email-masked]>, Ismail Lsm <[email-masked]>, Yuko Hughes <[email-masked]>
Cc: "Heta Nyrhinen (HNYR)" <[email-masked]>, Pritish Nandi <[email-masked]>
Date: Sun, 18 Oct 2020 11:21:26 +0000

Hi team,

For EXPAND 80 the customer might experience poor sound quality when using 3CX.
Our audio team has below explained how we can help them get a better experience by changing the settings in the softphone.

The main contributor to poor sound quality appears to be excessive gain settings in the 3CX audio settings (this was the case for both Near end and Far end test PC’s in the Phone Lab  - the same as used in previous tests). In short, 3CX offers an internal ‘microphone’ gain setting as a scaling factor of 0.5 to 8. Values of 2 or lower yield good audio performance, with expected narrowband quality limitations. Higher values yield distorted and less intelligible audio in the 3CX signal path (read: not caused by DXL). We should recommend users to try reducing this gain setting to 2 or lower for the NE if we have any complaints from the market for 3CX.

Best regards,
Sara Aknooni
Project Manager
Global Support and Service
+45 4470 0124
+45 7131 4960
Sennheiser Communications A/S · Industriparken 27 · DK-2750 Ballerup · Denmark
<https://www.eposaudio.com/en/dk/enterprise/products/adapt-660-noise-cancelling-bluetooth-headset-1000200>

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