Detect incoming calls

I would like to detect incoming calls in a gsm modem.

I am developing an application in VB and I am interested in detect them.

I have a Nokia 22 modem connected with my pc and I am using Hyperterminal to connect with it.
What I want to do exactly is that when the modem will be receiving a call, hyperterminal show me something to indicate me that the modem is ringing.
I want too, to detect when a called is missed.Are there any list where I can check them?

The modem is well-connected because I can send and receive messages, but when I receive a voice call the modem doesn't attend anything.

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When u receive a voice call,RING appears on the hyperterminal,I suppose u r familiar with it, bu then u have to answer the calll using the ATA command, then u can receive the voice call.

as far as receiving the ring in a program u can create a seperate thread and wait on the com port for the ring or any incoming sms

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The modem is probably configured to detect/accept data calls only. Try chanding the call mode. More details can be found in the AT commands guide at

Good Luck!
Based on your settings you will get the message:
- Ring data
- Ring voice
- Ring fax
The ring indicator will start to toggle by voice, data or fax call. From my side to have a look on the messages that comes in is the better way.
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