AASTRA 600c_d for SIP-DECT User Manual EN - Manual (Page 40)

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Basic functions
Adapting to your environment
Your handset has two functions which can be used to adapt the handset to loud environments:
If you activate the function using the menu ❯❯❯ Audio > Ringer settings > Noise detection, the
ringer volume is automatically increased in loud ambient noise. Make sure in this case that you have
not set the ringer volume to “Increasing”.
If you activate this feature using the menu ❯❯❯ Audio > Loud environment, the handset will
attempt to improve the speech quality in a loud environment. This applies to connections via the
handset itself and with a wired headset (but not to Bluetooth headsets and the handsfree mode).