Sony Ericsson TT4031 (SE-GM29) - Manual (Page 69)

Owner’s Manual Rev 1.0 Page 69 of 69
When single mode is selected the call originating and hang-up procedures are
similar to procedures specified in ITU-T Recommendations V.25ter, T.31 and
T.32. In GSM there can be voice followed by data (refer to GSM 02.02),
alternating voice/data (refer to GSM 02.02) and alternating voice/fax calls
(refer to GSM 02.03).
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.
<mode> Description
0 Single mode. Default value.
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
Note!_
2.11 AT+CVHU Voice Hang-Up
Description Command Possible Responses
Set Command +CVHU=[<mode>] •_ +CME ERROR: <err>
•_ OK
Read command +CVHU? •_ +CVHU: <mode>
•_ +CME ERROR: <err>
Test if the command is
supported
+CVHU=? +CVHU: (list of
supported <mode>s)
Selects whether ATH or “drop DTR” causes a voice connection to be
disconnected or not. Voice connection also includes alternating mode calls
that are currently in voice mode.
NOTE! - When <mode>=2, this command must be
viewed in conjunction with the V.25ter command &D, or
&D will be ignored.