User Manual

2. CALL CONTROL
91
LZT 123 7263 R1A
2.11 AT+CMOD Call Mode
Selects the call mode of further dialing commands (D) or for next
answering command (A). Mode can be either single or alternating. In
this ETS, terms “alternating mode” and “alternating call” refer to all
GSM bearer and teleservices that incorporate more than one basic
service (voice, data, fax) within one call.
When single mode is selected the call originating and hang-up
procedures are similar to procedures specified in ITU-T
Recommendations V.25ter [4], T.31 [5] and T.32 [6]. In GSM there can
be voice followed by data (refer GSM 02.02 [7]), alternating voice/data
(refer GSM 02.02 [7]) and alternating voice/fax calls (refer GSM 02.03
[8]).
Test command returns values supported by the TA as a compound
value.
Note! +CMOD is set to zero after a successfully completed alternating mode
call. It is set to zero also after a failed answering. The power-up, factory
(&F) and user resets (Z), also set the value to zero. This reduces the
possibility that alternating mode calls are originated or answered
accidentally.
Description Command Possible Responses
Request Call Mode AT+CMOD=[<mode>] •OK
•ERROR
Shows the current
setting
AT+CMOD? •+CMOD:<mode>
•OK
•ERROR
Show if the command
is supported
AT+CMOD=? •+CMOD:(listof
supported
<mode>s)
•OK
•ERROR
<mode> Description
0 Single mode (default)
In order to avoid accidental originating or answering of
alternating calls is <mode> set to single mode in following
cases:
- after a successfully completed alternating mode call;
- after a unsuccessful answering;
- after successfully execution of the commands &F and Z
1 Alternating voice/fax (teleservice #61). Not Supported
2 Alternating voice/data (bearer service #61). Not Supported
3 Voice followed by data (bearer service # 81). Not Supported
4..127 Reserved by GSM 07.07. Not Supported