AT Commands User Manual may be: − 0 single mode − 1 alternating voice/fax (teleservice 61) Note: Bearer service 61 ( =2) and Bearer service 81 ( =3) are not supported. : the total number of characters, including line terminators, in the information text does not exceed 2041. The text is the failure cause from GSM04.08 or a specific failure cause as specified in Appendices 18.3 and 18.4 is an integer in range of 0 to 255. A value different than zero causes a tone of duration /10 seconds. The value 1 is default. If the value 0 is selected, the tone duration is set to 1/10 seconds.
23 6.9 Call mode +CMOD Command syntax Description AT+CMOD= AT+CMOD= This set command selects the call mode of further dialing commands (D) or for next answering command (A). Read command +CMOD: OK AT+CMOD? Test command +CMOD: (0-1) i.e. list of supported OK AT+CMOD=? 6.10 Hang up call +CHUP Command syntax Description AT+CHUP This execution command causes the TA to hang up the current GSM call of the ME. OK or CME ERROR: AT+CHUP Test command OK AT+CHUP=? 6.11 Extended error report +CEER Command syntax Description AT+CEER This execution command causes the TA to return one or more lines of information text , determined by the ME manufacturer, which offer an extended report of the reason for:
− the failure in the last unsuccessful call setup or in-call modification − the last call release − the last unsuccessful GPRS attach or unsuccessful PDP context activation − the last GPRS detach or PDP context deactivation The displayed text may contain only the numeric code if requested by the customer. +CEER: OK Test command OK AT+CEER=? 6.12 Tone duration +VTD Command syntax Description AT+VTD= This command refers to an integer that defines the length of tones emitted as a result of the +VTS command. Read command +VTD: OK AT+VTD? Test command +VTD=(0-255) i.e. list of supported s OK AT+VTD=?