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ActiveXperts.com > Support > Knowledge base > SMS Messaging Server > GSM Modem Channels

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Browse "GSM Modem Channels" Questions:

Q8200010: How can i determine whether a GSM Modem is supported by SMS Messaging Server ?
ActiveXperts supports any modem that is compliant with both ETSI GSM 07.05 and ETSI GSM 07.07 standards. Please note this doesn't necessarily mean that a modem that is compliant to these standards is automatically a good modem. There are many cheap modems around, with different firmware versions etc. For a list of recommended modems, please click here.
SMS Messaging Server > GSM Modem Channels

Q8200014: Which GSM modems do you recommend for ActiveXperts SMS Messaging Server?
For more information on recommended modems for ActiveXperts SMS Messaging Server, click here.
SMS Messaging Server > GSM Modem Channels

Q8200015: I'm evaluating ActiveXperts SMS Messaging Server. Which GSM phones can be connected and controlled by your software?
SMS Messaging Server supports both GSM Modems and GSM Phones. The GSM Phone can basically be any business cellular phone that supports the AT+C command set and that has a serial-, Bluetooth or Infrared interface. For a list of raccomended GSM Modems, click here..
SMS Messaging Server > GSM Modem Channels

Q8200017: I have connected my GSM modem to my PC, but I am not able to communicate. What could be the problem?
Please make sure you have correctly installed the drivers for your GSM device (modem, mobile phone) and that the GSM device is correctly connected to it. Then verify that the device is working fine under Windows, otherwise you won't get it to work with ActiveXperts. To verify that the device is working fine under Windows, make sure you can connect to your phone through HyperTerminal. On Windows XP/2003 you can install Hyper Terminal through: Start > (Settings) > Control Panel > Add or Remove P...
SMS Messaging Server > GSM Modem Channels

Q8200020: My GSM modem doesn't seem to work well with your software. What's the best way to troubleshoot?
First, you should check the GSM Modem Channel properties. Make sure that a SIM card is inserted and that a PIN code is provided (if required). To see real-time communication details, use the ActiveXperts SMS Messaging Server Monitor. A shortcut is located in the Start Menu. To get more detailed information, you can enable logging for a GSM Channel. To enable logging, start the Registry Editor (REGEDIT.EXE or REGEDT32.EXE), and set the following Registry entry:     HKLM\S...
SMS Messaging Server > GSM Modem Channels

Q8200025: What is the throughput of GSM? So, how many messages can be sent/received per second using a GSM modem?
You can send/receive only 1 messages per 5 seconds using GSM. It's 10-12 messages per minute. This throughput basically applies to all available GSM modems, and is limited by the GSM protocol.
SMS Messaging Server > GSM Modem Channels

Q8200035: Why do I need to enter the SIM card's SMS number?
Because it is not possible to read the SMS number from the SIM card. In fact, the SMS number of the SIM card is not really required by the software, but is used for displaying and logging purposes.
SMS Messaging Server > GSM Modem Channels

Q8200040: What's the meaning of +CME ERROR: 3 ?
It means that the GSM modem is hanging. You need to restart the GSM modem manually.
SMS Messaging Server > GSM Modem Channels

Q8200050: I'm using 4 GSM Modem channels now. Can I add more GSM Modem channels?
By default, the maximum number of GSM Modem channels is set to 4. To increase this number, change the following registry key: HKLM\Software\ActiveXperts\SMS Messaging Server\Performance\ThreadsGsm. Please note that the engine will consume more resources when this number is increased, because it needs to create additional threads to handle these channels.
SMS Messaging Server > GSM Modem Channels

Q8200200: The SMS Messaging Server Monitor shows Error 30102 when opening the port. What does it mean?
This means that the COM port does not exist. You only get this error if you use a COM port (like COM1) rather than a Windows Telephony device (like 'Standard 9600 bps Modem'). Error 30102 does NOT mean that the port is already in use. If the port would already be in use, you would get another error: 30103.
SMS Messaging Server > GSM Modem Channels

Q8200210: The SMS Messaging Server Monitor shows Error 30103 when opening the port. What does it mean?
This means that the port you are attempting to open is already in use by another application. You only get this error if you use a COM port (like COM1) rather than a Windows Telephony device (like 'Standard 9600 bps Modem'). Check if there's another application that is already using the COM port. In some situations, you may want to benefit from a thing called 'port sharing', where one port can be shared by multiple applications. To benefit from 'port sharing', you must use Windows Telephony devices ...
SMS Messaging Server > GSM Modem Channels

Q8200220: The SMS Messaging Server Monitor shows Error 30201 when opening the port. What does it mean?
This means that the Windows Telephony Device you are using, is NOT defined on the computer. You may have made a typing mistake. Error 11201 does NOT mean that the port is already in use (you would get error 11202). You will never get this error when using direct COM ports (like 'COM1'), but only when using Windows Telephony devices.
SMS Messaging Server > GSM Modem Channels

Q8200230: The SMS Messaging Server Monitor shows Error 30202 when opening the port. What does it mean?
This error only occurs when using Windows Telephony devices (like 'Standard 9600 bps Modem'). The error implies that the Windows Telephony device is valid, but that the associated COM port is either already in use, or does not exist. The error does NOT imply that the Windows Telephony device is invalid (that would give error 30201); it neither implies that the Windows Telephony device is already used (that would give error 30204).
SMS Messaging Server > GSM Modem Channels

Q8200240: The SMS Messaging Server Monitor shows Error 30203 when opening the port. What does it mean?
This error only occurs when using Windows Telephony devices (like 'Standard 9600 bps Modem'). The Windows Telephony device name is valid,. There can be two reasons for this error: The Windows Telephony device is already in use by another application; The port speed is wrong; Windows is able to open the port, but is not able to initialize the device properly because of the wrong speed. Make sure that the port speed of the device and the port settings of the Telephony device in the Control Pane...
SMS Messaging Server > GSM Modem Channels

Q8200245: Can I send SMS messages using GPRS ?
First of all, you need a modem that supports GPRS. You also need a provider that supports GPRS (not all providers support GRPS!) To send an SMS over GPRS, add the following to your modem initialization string: AT+CGATT=1;AT+CGSMS=0 The first command enables GPRS (disabled by default); the second command specifies to send SMS over GPRS instead of GSM. You can now send SMS messages over GSM. However, if the provider does NOT support GPRS, you will receive the following error: +CMS...
SMS Messaging Server > GSM Modem Channels

Q8200247: Is it possible to change the SMSC address stored in my GSM modem ?
You can set the service center address with AT+CSCA in two ways: Using HyperTerminal; Start the Windows HyperTerminal application and type the AT+CSCA command with the requested parameter (see below). Put the AT+CSCA string in the initialization string of the modem, when the modem has been configured via the Control Panel, and you are using the TAPI device name. The syntax for the AT+CSCA command: AT+CSCA=""
SMS Messaging Server > GSM Modem Channels

Q8200250: What happens to new incoming messages when the SIM/Phone memory is full ?
You won't lose the message. The new message are simply not accepted by your GSM modem, and the provider will queue the messages for a couple of days until there is free space on the memory card again.
SMS Messaging Server > GSM Modem Channels

Q8200260: Which commands are sent to the GSM modem to send a message? Can I see a log of all sent/received commands?
Yes, you can see all commands using a trace file. By default, tracing is NOT switched on. Tracing is enabled/disabled per channel.You can enable tracing for your modem by specifying a log file for the particular channel in the registry:     HKLM\Software\ActiveXperts\SMS Messaging Server\Trace\GSM MODEM.xxxx , where xxxx is the actual channel number. After you change this registry value, you MUST restart the SMS Messaging Server engine (service) for the changes to take e...
SMS Messaging Server > GSM Modem Channels

Q8200270: When I try to retrieve SMS messages from my mobile phone, I am getting the following error message: "Preferred message storage not supported on this phone".
Most probably, you are using a GSM phone running on the Symbian OS. This phone does not allow you to receive messages through the built in GSM modem. The only solution is to use another phone or a GSM modem (recommended). Some phones which cannot be used to receive SMS are: Nokia 6600 Nokia 7200 Nokia N-series
SMS Messaging Server > GSM Modem Channels

Q8200280: I'm using a GSM modem (WaveCom Fastrack). The following error comes up: "Error#30351: Unexpected response from modem". In the log file, I see some undisplayable characters received from the modem. What could be the problem?
Most probably, the baud rate causes the problem: COM port and modem are not sending/receiving at the same speed. We strongly recommend to use 9600bps. Two things you need to do: Make sure that your COM port is configured to use 9600bps. To do so, open the Windows Device manager and click on COM1-properties. There you can set it to 9600bps. Set the modem to 9600bps. The following FAQ item describes how to set your modem to a different speed: FAQ#Q5200075.
SMS Messaging Server > GSM Modem Channels

Q8200290: I am using an USB GSM modem, sometimes i receive error 30201 ('Unable to select device' ). What is wrong ?
GSM modem consume power when receiving and sending messages, because signals have to be transmitted to the network. USB modems get the power from the USB port of the PC, sometimes this is not enough and the modem will restart due to power loss. Please try the following: Have a look at this KB item first; Try another USB port; Connect the modem via an USB hub; Make sure the signal strength is okay; Move the modem to another location; Use an USB Y cable, which takes power fro...
SMS Messaging Server > GSM Modem Channels

Error codes
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