MC55_ATC_V04.00 Page 425 of 475 3/17/06
Confidential / Released
 
Parameter Description
Type of ring tone. You have a choice of 7 different ring tones and melodies. All will be played from the audio
output selected with the AT^SNFS command. <type>=0 is only intended for muting. 
0 Mutes the currently played tone immediately. 
1 Sequence 1 
2 Sequence 2 
3
(D)
Sequence 3 
4 Sequence 4 
5 Sequence 5 
6 Sequence 6 
7 Sequence 7 
Volume of ring tone, varies from low to high 
0
(D)
Mute 
1Very low 
2 Identical with 1 
3Low 
4 Identical with 3 
5Middle 
6 Identical with 5 
7 High 
Status of test ringing. Indicates whether or not a melody is currently being played back for testing 
0 Switched off 
1 Switched on 
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. 
• The test ringing signal cannot be activated while an MTC is ringing (ERROR). 
• If an MTC arrives during test playback, test ringing will be deactivated and "normal" ringing reactivated
(RING). Likewise, an MOC will also stop test ringing. 
• If no optional parameter is entered, the old value will be kept. 
<type>
(num)
<volume>
(num)
<status>
(num)