At+Cgsn Request Product Serial Number Identification (Imei) Identical To Gsn; At+Chld Call Hold And Multiparty - Siemens TC37 Module At Command Reference

AT Command Set
4.13 AT+CGSN Request product serial number identification (IMEI) identical
to GSN
Test command Response
OK
AT+CGSN=?
Execute command Response
AT+CGSN TA returns identification text for determination of the individual ME.
<sn> OK
Parameter
<sn> IMEI of the telephone (International Mobile station Equipment Identity)
Reference Note
GSM 07.07 See also "AT+GSN Request TA serial number identification".

4.14 AT+CHLD Call hold and multiparty

Test command Response
+CHLD: (list of supported <n>s)
AT+CHLD=?
OK
Execute command Response
AT+CHLD=[<n>] 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:
phony).
OK
If error is related to ME functionality:
+CME ERROR: <err>
Parameter
<n>
Reference Note
GSM 07.07 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.
TC3X_ATC_01_V04.00
Supplementary services are only applicable to teleservice 11 (Speech tele-
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
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