[Asterisk-Users] Codecs and bandwidth

[Wiley Siler]

I assume ISDN accomplishes this since the PRI is set to use channel 24
for signaling.  Your 64K channels is data and the control overhead is
sent on the signaling channel.

Actually, everything I have seen is around 80K full duplex for a uLaw
channel with overhead.  That is point to point...

W



-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Tim Pushor
Sent: Monday, July 18, 2005 9:22 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [Asterisk-Users] Codecs and bandwidth

Hi Friends,

Something I'd like to shed some light on if possible - how is it that a 
single ISDN conversation only uses 64K for bidirectional communication 
(using ulaw, correct?), but on several occasions now have seen 
references to ulaw voip conversations using 64K per side of the 
conversation, plus packet overhead 
(http://www.zytrax.com/tech/protocols/voip_rates.htm - seems to be down 
now - plus other references) for a total of over 128K per ulaw 'full 
duplex' voice conversation?

Thanks
Tim

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