Siemens TC63 - page 430

TC63 AT Command Set
18.15 AT^SNFS s
TC63_ATC_V00.490 Page 430 of 501 5/24/05
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To switch back and forth:
AT^SNFW Stores the audio mode and the interface.
OK
AT^SNFS=4 Switches to the handset connected to analog interface 1.
OK
AT^SNFS=2 Switches to the handsfree device at analog interface 2.
OK