Low volume sound on speaker

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Hi Everyone,

When using the Aastra 6869i on speaker phone, I find it very hard to hear the person on the other end even with max volume. On the handset, they sound fine.

In my config file, I have handsfree tx gain: 10 and handsfree rx gain: 10 but it didn't really seem to help much.

Is there anything else i can do ? The Firmware Version   4.3.0.1052

Thanks!