Data on voice transfer in Gsm network

[mohammady_a]

I need a gsm modem to transfer data on voice channel. Are there commercial one? Can you help me please.

 

[kripacharya]

why particularly over voice channel ? Since gsm voice is anyway highly compressed/ digitised its unlikely you will be able to use it the way you expect.

You should use the gPRS feature instead.

 

[mohammady_a]

I try to transfer voice in data channel of GSM network but it has unfavorable results because of limitations of GSM network in data channel. I needed to transfer voice as data in online communication without delay and good quality. You believe that in GPRS network I can communicate online on data channel with good quality?

 

[kripacharya]

what are you talking about ??

GPRS is designed to carry data

 

[mohammady_a]

Are there commercial phone to transfer voice based on GPRS without compression. I need to apply some changes on voice, with new compression, and a commercial phone with a place to keep microcontroller board.