Specifications

3GPP
3GPP TS 27.007 V6.3.0 (2003-
06)
2
5
Release 6
6.4 Call mode +CMOD
Table 12: +CMOD parameter command syntax
Command
Possible response(s)
+CMOD=[<mode>]
+CMOD?
+CMOD: <mode>
+CMOD=?
+CMOD: (list of supported <mode>s)
Description
Set command selects the call mode of further dialling commands (D) or for next answering command (A). Mode can be
either single or alternating (in the present document, terms "alternating mode" and "alternating call" refer to all
GSM/UMTS 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 hangup procedures are similar to procedures specified in ITU-T
Recommendations V.250 [14], T.31 [11] and T.32 [12]. In GSM/UMTS there can be voice followed by data (refer
3GPP TS 22.002 [1]), alternating voice/data (refer 3GPP TS 22.002 [1]) and alternating voice/fax calls (refer 3GPP TS
22.003 [2]). Refer next two subclauses for alternating call control methods.
Test command returns values supported as a compound value.
NOTE: +CMOD shall be set to zero after a successfully completed alternating mode call. It shall be set to zero also
after a failed answering. The power-up, factory (&F) and user resets (Z) shall also set the value to zero.
This reduces the possibility that alternating mode calls are originated or answered accidentally.
Defined values
<mode>:
0
single mode
1 alternating voice/fax (teleservice 61)
2 alternating voice/data (bearer service 61)
3 voice followed by data (bearer service 81)
also all other values below 128 are reserved by the present document
Implementation
Mandatory when alternating mode calls are implemented in the TA.
6.5 Hangup call +CHUP
Table 13: +CHUP action command syntax
Command
Possible response(s)
+CHUP
+CHUP=?
Description
Execution command causes the TA to hangup the current GSM/UMTS call of the MT.
NOTE: The purpose of this command is not to replace the V.250 [14] command H, but to give an assured
procedure to terminate an alternating mode call. Refer next subclause.
Implementation
Mandatory when alternating mode calls implemented in the TA.