AVer SF2111H-DVR user manual - Manual (Page 60)

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System > Audio
IP camera supports 2-way audio (mono). User can send audio from IP camera built-in MIC (depending
on different models) to remote site; User can also send audio from remote site to IP camera’s external
speaker.
a. IP camera to PC: select “Enable” to start this function.
b. In live video screen, click button to start chatting. Press again to mute. Click button to
turn on or off the speaker of PC.
[Note] The Audio will not be smooth when enable SD/SDHC card recording function simultaneously.