AT Commands Phone Terminal Terminated 40
4.11.2 Unsolicited result codes
+CRING Call Mode Indication
4.11.3 Use scenarios
Mode Change and Call Hang-up
This scenario shows the following steps:
• Set call mode to voice/data
• Enable cellular result code indication
• Switch from voice to fax and answer fax call
• Hang up fax call
Description: When enabled by using AT+CMOD, an incoming call is indicated with +CRING
instead of +RING.
Unsolicited result code:+CRING: <type>
Parameter:
<type>:
<type> Description
ASYNC Asynchronous transparent
SYNC Synchronous transparent
REL ASYNC Asynchronous non-transparent
FAX Facsimile
VOICE Normal voice
VOICE/XXX Voice followed by data (‘XXX’ is SYNC, ASYNC, REL
ASYNC, or REL SYNC)
ALT VOICE/XXX Alternating voice/data; voice first
ALT XXX/VOICE Alternating voice/data; data first
ALT VOICE/FAX Alternating voice/fax; voice first
ALT FAX/VOICE Alternating voice/fax; fax first
AT command Response Phone mode Comment
AT+CMOD?
+CMOD: 0
OK
Single mode enabled
AT+CMOD=1 Change to alternating voice/
fax
OK
AT+CRC=1 Extended format enabled
OK
+CRING: ALT
VOICE/FAX
Voice call Voice call followed by fax call
indication
ATA Voice call Switch to fax call
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