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MC55 AT Command Set
7. Call related Commands
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MC55_ATC_V03.03 Page 125 of 459 9/9/05
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7. Call related Commands
The AT Commands described in this chapter are related to Mobile Originated (MOC, i.e. outgoing) Calls and
Mobile Terminated (MTC, i.e. incoming) Calls.
7.1 Call Status Information
For Circuit switched calls, including voice, fax and data calls, call status information is available with URC
"+CIEV: call" (configurable via AT commands AT+CIND and AT+CMER) or - in more detail - from the list of current
calls. This list can be displayed on request via at commands AT+CLCC and AT^SLCC. It can also be issued by
the ME in the form of an unsolicited result code "^SLCC" if configured with AT^SLCC and AT+CMER.
URC "+CIEV: call" and URC "^SLCC" can be configured using AT command AT^SCFG. An overview of the pos-
sible configurations and their consequences for the availability of call status information will be given here.
Generally speaking, the call status values recognized by the ME are as follows:
•active
•held
• dialing (MOC)
• alerting (MOC)
• incoming (MTC)
• waiting (MTC)
• terminating: The call is not active anymore, but inband information is still available.
• dropped: The call has been suspended by the network, but may be resumed later.
The values "terminating" and "dropped" are not standardized for AT command AT+CLCC, and therefore only
available for command AT^SLCC. A call in any of these two states will not appear in the list of current calls as
displayed with AT+CLCC.
A call that is not recognized by the ME is considered to be in "unknown" state.
Some networks may schedule a traffic channel for a call that is not yet in the "active" state. This is reflected in
parameter <traffic channel assigned> of AT command AT^SLCC and the corresponding URC.
Depending on the value of AT^SCFG setting <succ>, Indicator "+CIEV" will be issued (if configured with
AT+CIND and AT+CMER)
• when a state transition ends in state "active" or in state "unknown"
(if AT^SCFG setting <succ>=''restricted'').
• when any state transition (including transitions beginning or ending in state "unknown") occurs in the list of
active calls, or when a traffic channel is established
(if AT^SCFG setting <succ>=''verbose'').
The indicator value for indicator "+CIEV: call" will be "1" if at least one call is in states "held" or "active", and "0"
otherwise.
Depending on the value of AT^SCFG setting <sucs>, Indicator "^SLCC
" will be issued (if configured with write
command AT^SLCC and AT+CMER)
• when a state transition ends in state "active" or in state "unknown" (if AT^SCFG setting <sucs>="restricted")
• when any state transition (including transitions beginning or ending in state "unknown") occurs in the list of
active calls, or when a voice channel is established (if AT^SCFG setting <sucs>="verbose").
Due to compatibility considerations, the powerup default for AT^SCFG setting <succ> is "restricted", offering
compatibility to the standard behaviour of indicator "+CIEV: call", while the default for setting <sucs> is "ver-
bose".
In order to see the URCs, event reporting for both indicators must be explicitely configured with the appropriate
AT commands.
- AT Command Set 1
- Contents 3
- List of Tables 10
- List of Figures 11
- 1. Introduction 12
- 1.2 Related documents 13
- 1.3 Document conventions 14
- 1.3.1 Quick reference table 14
- 1.4 AT Command Syntax 16
- 1.4.1 Using Parameters 16
- 1.5 Supported character sets 18
- 1.9 Errors and Messages 27
- 2. Configuration Commands 28
- 2.2.1 AT&V responses 30
- 3. Status Control Commands 57
- 3.2 AT+CIND Indicator control 59
- Management (SM) 71
- 4.1 AT\Q Flow control 83
- 4.5 ATE Enable command echo 87
- 4.7.1 Autobauding 91
- 5. Security Commands 97
- MC55 AT Command Set 100
- 5.4 AT+CLCK Facility lock 107
- 5.5 AT^SLCK Facility lock 112
- 5.6 AT+CPWD Change Password 113
- 5.7 AT^SPWD Change Password 117
- 6. Identification Commands 119
- 7. Call related Commands 125
- 7.2 ATA Answer a call 126
- 7.10 AT+CHUP Hang up call 136
- 7.28 ATP Select pulse dialing 160
- 7.29 ATT Select tone dialing 160
- 8. Network Service Commands 161
- 8.5 AT+CSQ Signal quality 170
- 8.6 AT^SMONC Cell Monitoring 171
- 8.7 AT^SMOND Cell Monitoring 173
- 8.8.1 AT^MONI responses 177
- 8.8.2 Service states 178
- 8.9.1 AT^MONP responses 180
- 8.10 AT^SMONG GPRS Monitor 181
- 8.12 AT^SHOM Display Homezone 185
- 9.5 AT+CCUG Closed User Group 195
- 9.7 AT+CCWA Call Waiting 201
- 10. Internet Service Commands 218
- Remote Client 239
- 11. GPRS Commands 251
- 12. FAX Commands 286
- 12.23 AT+FRM Receive Data 310
- 12.24 AT+FRS Receive Silence 311
- 12.26 AT+FTM Transmit Data 313
- 13.1 SMS parameters 316
- 14. SIM related Commands 353
- 15.2 ^SSTN SAT Notification 363
- 15.4 AT^SSTR SAT Response 365
- 16. Phonebook Commands 366
- 16.9 AT+CNUM Read own numbers 384
- 17. Audio Commands 386
- 17.5 AT+CMUT Mute control 389
- 17.6 AT+VTD Tone duration 390
- 18. Hardware related Commands 411
- 18.2 AT+CALA Set alarm time 412
- 19. Miscellaneous Commands 424
- 20. Appendix 428
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