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'[EE] VOIP Codecs and stuff'
2005\09\14@071733 by Russell McMahon

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OKI site.
VOIP telephone chipsets

       http://www2.okisemi.com/site/applications/VoIPPhone.html

VOIP Codec

   Intro

       http://www2.okisemi.com/site/productscatalog/telecomics/linearcodecs/Intro-9995.html

   Datasheet (1.2 MB pdf)(64 pin QFP)

A-law and ulaw CODECs, including (surprise) some in DIP.

       http://www2.okisemi.com/site/productscatalog/telecomics/pcmaulawcodecs/TelecomTables-4.html



       RM

2005\09\14@075235 by Mauricio Jancic

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What about the Microchip TCP/IP stack plus a compression codec plus a
ENC28J60 or any ethernet chip?

do you thik it would work?

Kind Regards,


Mauricio Jancic
Janso Desarrollos - Microchip Consultants Program Member
spam_OUTinfoTakeThisOuTspamjanso.com.ar
http://www.janso.com.ar
(54) 11 - 4542 - 3519

{Original Message removed}

2005\09\14@100632 by Alex Harford

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Another VOIP Codec:

http://www.dspg.com/dspg/vp141.html

2005\09\14@175931 by Peter

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On Wed, 14 Sep 2005, Mauricio Jancic wrote:

> What about the Microchip TCP/IP stack plus a compression codec plus a
> ENC28J60 or any ethernet chip?
>
> do you thik it would work?
            ^n

If you have enough bandwidth for u-law you do not need compression.
u-law needs 8 kByes/sec in each direction with *low* latency. The
simpler the circuit and the software the better. There is no reason why
it would not work. Probably in a dsPIC with a/d so a little audio
filtering can be performed. The easiest protocol to implement is
probably IAX2 (Asterisk's native protocol). TCP is not required, UDP is
enough. The other protocols seem to have been designed by commitee (H323
for sure, SIP comes close). IAX2 *works* _*NOW*_.

Peter

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