[Asterisk-Users] RE: iLBC

[Martin Pycko]

But since we send it in 50 bytes frames it's going to take averagely
less IP/UDP/RPT or IAX headers to transmit the voice than when using
GSM (33 bytes per frame). Of course the delay is greater.

regards
Martin

On 17 Apr 2003, Steven Critchfield wrote:

> On Thu, 2003-04-17 at 09:40, Mark Spencer wrote:
> > > according to raft-ietf-avt-ilbc-codec-01, rtp payload is either 38 or 50
> > > bytes, right?  kphone is sending 50 byte payloads, but * seems to expect
> > > 52 byte payload:
> > >
> > > WARNING[14350]: File codec_ilbc.c, Line 141 (ilbctolin_framein): Huh?  An
> > > ilbc frame that isn't a multiple of 52 bytes long from RTP (50)?
> >
> > According to draft-duric-rtp-ilbc-01.txt (the document I'd used), it says:
> > "The codec has a bit rate of 13.867 bits/s using ... 416 bits per block,
> > which can be packetized in 52 bytes.
>
> Strange question. iLBC compresses 64kbits to 13.867kbits, GSM compresses
> 64kbits to 13.2kbits. Is there a expectation tha iLBC is going to become
> a wider deployed standard than GSM?
>
> --
> Steven Critchfield  <critch at basesys.com>
>
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