Hai I am developing Sms Project in vb.net.I can Send and receive Sms Easily. I can attented Incoming call and dial. but not hearing and talk. I connected with com Port. This is possible or not for talking and hearing. please tell me
A:
Without knowing the GSM modem you are using it's kind of difficult to give you any help.
Just to make sure. You have a handset connected to your modem, right? Some modems, like for example the Siemens TC35, require the use of a handset to hear and talk.
jassuncao
2009-03-28 14:10:43
i have visiontek 81 g modem sir . this modem have hand set that is working properly. but pc headphone and mic not working. what i do?. Please tell sir this is possible or not. this modem connected to com port. thank you sir
somu
2009-03-30 09:08:03
I searched in google and found multiples products with the same designation. Can you provide a link to the product?
jassuncao
2009-03-30 11:11:23
I very much doubt that it's possible to send voice over your COM port, usually these are only used for data and commands...
Wim
2010-02-16 20:03:01
Yes it is not possible. That is why some GSM modems provide connectors for the mic and speaker. A requirement for voice calls.
jassuncao
2010-02-17 17:57:46
A:
For Windows programming I suggest looking into the TAPI (Telephony API) library which does this. For Windows Mobile/CE (maybe other Windows versions as well?) there is also the RIL (Radio Interface Layer) which is a bit more low-level than TAPI and less documented. TAPI is documented in MSDN, but it is still a bit difficult to use.
If you can get a direct connection to the GSM modem for example via a COM (serial) port then you could also make a phone call using standard AT-commands. The command for dialing a number is "D" so "ATD555-12345678;" will make a voice call to 555-12345678. Skipping the ";" will set up a data call. Find the COM-port used by your GSM modem and send "AT\r" and check if you get a "OK" response. If you do, that's your modem.
kigurai
2009-07-05 18:12:41