Specifications

Chapter 16 – Audio Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 274
Notes:
• Before first using ring tones note that the following settings apply:
We have chosen to let you decide your own preferences when you start using ring tones. Therefore, factory
setting is AT^SRTC=3,0,0 (ring tones are muted). To activate ring tones for the very first time, first enter the
write command and simply change the volume. After applying a firmware update the volume and type selected
before the firmware update will be preserved.
• If the <type> is changed while a call is ringing (RING URC) or active, the ME returns OK, but the new melody
does not take effect until after the call has ended.
• Users should be aware that when using this AT command quickly after "^SYSSTART" a "+CME ERROR:
operation temporary not allowed" is received. The audio data may not yet be accessible, resulting in a short
delay (less than 400ms) before the requested AT command response is returned.
• This command is not PIN protected.
• This command is supported in airplane mode.