So,

1) The real encode/decode is done with an AMBE 3000 (like the dv3000, etc)

2) The DV3000 produces PCM audio frames

3) Those frames can be sent as uLAW, but this may not be what you want since

3a) Asterisk may need to transcode to some other format depending on connections

3b) Asterisk internally runs on PCM and only transcodes when needed

I would use the USRP channel driver since it handles PCM frames, is bidirectional, does PTT and I have already used it in this mode.

Just my view.

On Wed, Nov 4, 2015 at 2:56 PM, Robert Newberry <N1XBM@amsat.org> wrote:

If you're not seeing it then I must have it wrong. I'm trying hard but I think I'll get egg on my face. Page three says the gateway uses ulaw audio format to transfer linear digital audio to the repeater.

The dstar channel driver uses ulaw audio in digital frames too. I believe you'll need a dongle of sorts.

I feel like I'm stepping in some deep shit. Allstar network wasn't even in my vocabulary two years ago.

N1XBM
Apparare Scientor
Paratus Communicare
Allstar Node # 27086, 41540, 41812, 42086

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