Specifications

3GPP
3GPP TS 27.007 V6.3.0 (2003-
06)
2
3
Release 6
Manufacturer, model and version commands work similarly as for TA, except that the serial number query returns the
International Mobile Station Equipment Identity (IMEI) number. IMEI is fifteen digits long and consists of a type
approval code, a final assembly code, a serial number and a spare digit (refer 3GPP TS 23.003 [7]). When the TA is
implemented inside MT, the responses for both TA and MT queries will most likely follow the responses of MT
identification.
6 Call control commands and methods
This clause describes the control of GSM/UMTS calls. Normal data and fax call control is done as in ITU-T
Recommendations V.250 [14], T.31 [11] and T.32 [12]. For voice call originating, refer subclause "ITU-T V.250 dial
command D".
6.1 Select type of address +CSTA
Table 11: +CSTA parameter command syntax
Command
Possible response(s)
+CSTA=[<type>]
+CSTA?
+CSTA: <type>
+CSTA=?
+CSTA: (list of supported <type>s)
Description
Set command selects the type of number for further dialling commands (D) according to GSM/UMTS specifications.
Test command returns values supported a compound value.
Defined values
<type>: type of address octet in integer format (refer TS 24.008 [8] subclause 10.5.4.7); default 145 when dialling
string includes international access code character "+", otherwise 129
Implementation
Mandatory when other than default value allowed.
6.2 ITU-T V.250 [14] dial command D
V.250 [14] dial command D lists characters that may be used in a dialling string for making a call or controlling
supplementary services in accordance with 3GPP TS 22.030 [19]. Their use in GSM/UMTS is listed in this subclause,
as well as new dial modifiers applicable only to GSM/UMTS are introduced. For a MT supporting AT commands only,
it is mandatory to support the control of supplementary services in accordance with 3GPP TS 22.030 [19] through the
dial command or through the specific supplementary service commands (+CCFC, +CLCK, etc.), where 3GPP TS 22.030
[19] identifies the supplementary services as mandatory.
V.250 dialling digits
1 2 3 4 5 6 7 8 9 0 * # + A B C (implementation of these characters is mandatory for GSM/UMTS)
D (implementation of this character is optional for GSM/UMTS, and it is ignored)
V.250 modifier characters
, (implementation of this character is mandatory for GSM/UMTS, but it may be ignored)
T P (implementation of these characters is mandatory for GSM/UMTS, but they are ignored)
! W @ (implementation of these characters is optional for GSM/UMTS, and they are ignored)
V.250 semicolon character