Chapter 3:  AT Commands Reference
 April 15, 2008 G24-L AT Commands Reference Manual 3-173
+CRTT, Ring Type Selection
This command plays one cycle of a ring tone, stops the cycle in the middle and sets the ring tone 
to be used.
The following table shows the +CRTT parameters.
Command 
Type Syntax Response/Action Remarks
Set
AT+CRTT=
<RingTypeNumber>, 
<operation>
OK
or:
+CME ERROR: <err>
The Set command sets the ring type 
and operation.
Read
AT+CRTT? +CRTT: 
<RingTypeNumber>
OK
or:
+CME ERROR: <err>
The Read command returns the ring 
type number.
Test
AT+CRTT=? +CRTT: (list of 
supported 
<RingTypeNumber>s), 
(list of supported 
<operation>s)
OK
or:
+CME ERROR: <err>
The Test command returns the list of 
supported tone type numbers and 
operations.
Table 3-115: +CRTT Parameters
<Parameter> Description
<RingType 
Number>
Ring tone styles (see Table 3-116)
<operation> Play or set a tone
0 Play (play one cycle)
1Set 
2 Stop