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3GPP TS 27.007 version 11.8.0 Release 11 33 ETSI TS 127 007 V11.8.0 (2013-10) Voice followed by data call (bearer service 81) Figure 4 shows commands to start the call, to switch from voice to data (In-Call Modification) and to hang up the call. +CMOD and +FCLASS commands indicate the current settings before dialling or answering command, not that they shall be given just before D or A command. Refer subclause "Cellular result codes +CRC" for possible +CRING result code values. Refer Annex F for a detailed example. MO AT+CMOD=3 AT+FCLASS=0 MT +CRING: VOICE/XXX AT+CMOD=3;+FCLASS=0 ATDxxx; ATA VOICE ATD or ATA or remote initiated DATA AT+CHUP or remote initiated hangup (or ATH or drop DTR) ATH or drop DTR or AT+CHUP or remote initiated hangup Voice/ data call (bearer service number 61) HANGUP TA sets +CMOD=0 Figure 4: Voice followed by data call Figure 5 shows the commands to start the call, to switch between modes (In-Call Modification) and to hang up the call. +CMOD and +FCLASS commands indicate the current settings before dialling or answering command, not that they shall be given just before D or A command. Refer subclause "Cellular result codes +CRC" for possible +CRING result code values. Refer Annex E for a detailed example. MT voice first +CRING: ALT VOICE/XXX AT+CMOD=2;+FCLASS=0 MO AT+CMOD=2 AT+FCLASS=0 MT data first +CRING: ALT XXX/VOICE AT+CMOD=2;+FCLASS=0 ATA ATDxxx; ATDxxx ATA VOICE AT+CHUP or remote initiated hangup (or ATH or drop DTR) ATD or ATA or remote initiated ATH or drop DTR or remote initiated DATA AT+CHUP or remote initiated hangup HANGUP TA sets +CMOD=0 Figure 5: Alternating voice and data call ETSI
3GPP TS 27.007 version 11.8.0 Release 11 34 ETSI TS 127 007 V11.8.0 (2013-10) Voice/ fax call (teleservice number 61) Figure 6 shows the commands to start the call, to switch between modes (In-Call Modification) and to hang up the call. +CMOD and +FCLASS commands indicate the current settings before dialling or answering command, not that they shall be given just before D or A command. The parameter "x" of +FCLASS command can be 1, 1.0, 2 or 2.0. NOTE 2: The transition from fax mode to voice mode is for further study. MT voice first +CRING: ALT VOICE/FAX AT+CMOD=1;+FCLASS=x MO AT+CMOD=1 AT+FCLASS=x MT fax first +CRING: ALT FAX/VOICE AT+CMOD=1;+FCLASS=x ATA ATDxxx; ATDxxx ATA VOICE ATD or remote initiated FAX AT+CHUP or remote initiated hangup (or ATH or drop DTR) refer ITU-T T.31 [11] and T.32 [12] for different hangup possibilities (also AT+CHUP shall hangup) HANGUP TA sets +CMOD=0 Figure 6: Alternating voice and fax call 6.7 Select bearer service type +CBST Table 14: +CBST parameter command syntax Command +CBST=[[,[,]]] +CBST +CBST= Possible response(s) +CBST: ,, +CBST: (list of supported s),(list of supported s),(list of supported s) Description Set command selects the bearer service with data rate , and the connection element to be used when data calls are originated (refer 3GPP TS 22.002 [1]). Values may also be used during mobile terminated data call setup, especially in case of single numbering scheme calls (refer +CSNS). Test command returns values supported as compound values. Defined values NOTE: The default values of the subparameters are manufacturer specific since they depend on the purpose of the device and data services provided by it. Not all combinations of these subparameters are supported by GSM/UMTS (refer 3GPP TS 22.002 [1]). : integer type 0 autobauding (automatic selection of the speed; this setting is possible in case of 3.1 kHz modem and nontransparent service) 1 300 bps (V.21) ETSI
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