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David Wilson dw at botanicus.netHi Fabio, On 15 January 2011 20:56, Fabio Pietrosanti (naif) <lists at infosecurity.ch> wrote: > > Maybe there are an area of conditions where transcoding doesn't happen, > like within the same operator or within national gsm operators > interconnections. > > If that could be confirmed, it would be possible to have a low latency > full-duplex communication data path at 13.3kbit/s (GSM codec) or > 12.2kbit (GSM EFR/AMR codec) to be managed such like a serial connection. > > On top of a protocol alike HDLC could provide a serial connection over a > GSM voice raw transport > > Someone willing to make a try? Note the L1 channel coding is intimately linked to characteristics of the codec/connection type, and it's just not as simple as treating the bits that usually carry codec frames as a serial link. For example block size and error correction varies by codec and even between individual frame types within a codec. I believe L2 has no automatic retransmission on frame error for voice channels, so that must also be handled. I'm not suggesting a solution, just pointing out these are not simple "boxes and arrows" to be freely substituted without detailed knowledge of the surrounding system. David