Digital voice on gsm modules

communicationgsm

I would like to understand how to handle digital voice on gsm modules.

After reading 3gpp gsm mux 07.10 specification it is my understanding that gsm modules can be configured to transport voice frames on dedicated channels (DLC) sending a SNC frame with bit3 set on.

I considered to use simcom sim900 module but official documentation indicates that SNC frames are not supported.

Are DLCs channels the right approach to send&receive voice frames?
is there another way to do it (PCM, PWM, I2S interfaces)?

Best Answer

My other brand GSM module has analogue in and out pin. Its take MIC IN and handle the coding and transmission inside the module.

Data sheet of your module has similar wording. may be, it work in same manner.

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Electronic – Dual-SIM phone, do they use 2 GSM modules ? Anyone has high level schematic

No, they don't have multiple GSM modules. That would drive up cost, size, weight. Since the user is only on one call or the other, there isn't a need for more than on GSM module.

EDIT Jan 31 '12. Wikipedia says there are phones that can use both at once. But I still believe there is only on GSM module.

Electronic – GSM/GPRS AT command – hitting a link

You're opening the socket OK but the part you're missing is that you'll need to issue an HTTP request to the server. The full documentation you'll probably want to look at is RFC2616 but the request should look roughly like this:

GET /SUB/PAGE.PY HTTP/1.1
Host: www.MYSERVR.com
(blank line)

The above probably violates a few standards because there are additional headers I believe you should include, but it should give you a pointer in the right direction. Maybe for a start install a Telnet client and try connecting that way rather than using a web browser so you can check that the request works OK and easily check the response you get back.

You need to send the above over the socket, so for that module take a look at AT+AIPW command.

Best Answer

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Electronic – Dual-SIM phone, do they use 2 GSM modules ? Anyone has high level schematic

Electronic – GSM/GPRS AT command – hitting a link

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