> 7 | Speakerphone Mode Details

> The speakerphone mode (AT^SNFS=2) has been optimized for the “Siemens Car Kit Portable HKP-500” and for a special arrangement of microphone, speaker and user. Physically, audio interface 2 (default) or 1 can be used.
> EP2 output is followed by a power amplifier with 8...40dB gain. The external microphone amplifier with 26...40dB gain needs to have good noise characteristic. Final adjustments can be done easily with AT commands.
> For product information on the Siemens Car Kit Portable HKP-500 see Chapter 9.