Siemens AT Command Set Cellular Engines Wireless Modules MC35 ユーザーズマニュアル

MC35_ATC_01_V04.00

Page 74 of 238

02.04.2002

Test command

AT+CGSN=?

Response

Execute command

AT+CGSN

Response

TA returns identification text for determination of the individual ME.
<sn> OK

Parameter

<sn> IMEI of the telephone (International Mobile station Equipment Identity)

Reference

GSM 07.07

Note

See also ”AT+GSN Request TA serial number identification”.

Test command

AT+CHLD=?

Response

 (list of supported <n>s)

Execute command

AT+CHLD=[<n>]

Response

TA controls the supplementary services Call Hold, MultiParty and Explicit Call
Transfer. Calls can be put on hold, recovered, released, added to conversation
and transferred.

Note:

 Supplementary services are only applicable to teleservice 11 (Speech tele-

phony).
OK
If error is related to ME functionality:
+CME ERROR: <err>

Parameter

0

Terminate all held calls; or set UDUB (User Determined User
Busy) for a waiting call, i.e. reject the waiting call.

1

Terminate all active calls (if any) and accept the other call
(waiting call or held call)

1X

Terminate the active call X (X= 1-7)

2

Place all active calls on hold (if any) and accept the other call
(waiting call or held call) as the active call

2X

Place all active calls except call X (X= 1-7) on hold

3

Add the held call to the active calls

Reference

GSM 07.07

Note

•  In conflicting situations, e.g. when a waiting call comes while there are already

held calls, the above procedures apply to the waiting call only. For example,
<n>=0 rejects the waiting call, but does not affect the held calls.

•  While the PDP context for GPRS is activated it is recommended to terminate

any calls with AT+CHLD=1 rather than usind ATH. This is significant because
ATH would also cancel an active PDP context. See also Chapters 2.12 and
6.3.2.