Laipac Technology Inc. M2M 3350 User’s Manual & Reference Guide6.5 Headphone JackThe modem is equipped with a 2.5mm stereo headphone jack so that you can connect aspeaker/microphone one-piece headset. Not all headsets work as every manufacturer uses adifferent pinout. We have tried to select a general pinout to be compatible with most headsets.Keep in mind that you can’t transmit voice calls through the USB or RS232 connector. If youwish to make a call, you must connect the headphone jack to the modem and not to your PC.7 COMMANDSNote: the following commands can be entered using HyperTerminal in Windows with the settings115200, 8, None, 1, NoneDescription ATCommandModule CommentsAT+CREG? CREG=,1Modem Synchronized on the networkCREG=,2Sync lost, re-sync attemptModuleSynchroCheckingCREG=,0Modem not synchronized on network,no synch attemptRINGATA Answer the callReceiving anIncoming CallOKATD 1234; Don’t forget the <;> at the end forVOICE callOK Communication establishedCME ERROR:11PIN code not enteredInitiate aCallCME ERROR: 3 AOC credit exceeded or communicationalready establishedATD 911; Don’t forget the <;> at the end forVOICE callInitiate anEmergency CallOKCommunicationLossNO CARRIERATHHang UpOKAT+CPIN=1234OKCME ERROR:16Incorrect PIN codeEnter PIN CodeCME ERROR: 3 PIN already enteredAT&WStoreParametersIn E2POK The configuration settings are storedinto E2P© 2002-2007 by Laipac Technology Inc. All Rights Reserved. Page 25