> 18.13 | AT^SNFM Set microphone audio path and power supply

> The AT^SNFM read command returns the microphone mute and supply voltage status.
> The AT^SNFM write command can be used to switch the microphone's audio path (muted / not muted) or to control the power supply of the VMIC line for the two microphone inputs of the TC65 Module. Please keep in mind that the TC65 Terminal has no programmable microphone power supply, therefore only the mute switch applies.
> The microphone can be muted or activated by changing <MicSwitch> in all audio modes (1 to 6) and during a voice call only. As an alternative, you can use the AT+CMUT command to mute the microphone.
> Syntax

> Test Command AT^SNFM=?
> Response(s)
> ^SNFM: (list of supported <MicSwitch>s) , (list of supported <MicVccCtl>s)
> OK

> Read Command AT^SNFM?
> Response(s)
> ^SNFM: <MicSwitch>, <MicVccState>
> OK

> Write Command AT^SNFM=[<MicSwitch>][, <MicVccCtl>]
> Response(s)
> OK
> ERROR
> +CME ERROR: <err>

> Reference(s) |  | PIN |  | ASC0 | ASC1 | USB | MUX1 | MUX2 | MUX3 |  |  | Charge | Q | Last
> SIEMENS |  | - |  | + | + | + | + | + | + |  |  | - | + | -

> Parameter Description

> <MicSwitch>(num)

> Microphone mute control parameter.
> Evaluated only during voice calls and if <MicVccCtl> is omitted, e.g. AT^SNFM=1.
> Command does not depend on audio mode.
> 0
> Mutes the microphone.
> 1(P)
> Activates the microphone.

> <MicVccCtl>(num)

> Microphone supply voltage control parameter. Controls the power supply VMIC of the two microphone inputs of the TC65 Module. Parameter is not applicable to the TC65 Terminal.
> CME error is given if <MicSwitch> is not omitted. Enter for example AT^SNFM=,1 or AT^SNFM=,2.
> 0
> Supply voltage is always switched off.
> 1
> Supply voltage is always switched on.
> 2(P)
> Supply voltage state during voice calls is controlled by the ME. Actual value is determined by parameter data set of the selected audio mode.

> <MicVccState>(num)

> Microphone supply voltage control status.
> Parameter is not applicable to the TC65 Terminal.
> 0
> Supply voltage was set to a constant value.
> 2
> Supply voltage state is controlled by the ME and depends on parameter data set of the selected audio mode.
> Notes

> • | The programmable power supply of the VMIC line gives you greater flexibility in connecting audio accessories or using the two analog audio interfaces for a variety of functions other than audio. A detailed description of the extended usage of the analog audio interfaces can be found in [10].

> • | During an active call, users should be aware that when they switch back and forth between different audio modes (for example handsfree on/off) the value of <MicSwitch> does not change, i.e. the microphone mode is retained until explicitly changed.