VoIP QOS best practices

Mon Feb 10 18:54:22 UTC 2003

If you are in an environment where the uplink is already saturated, or
nearly so, QOS is necessary.  But QOS only discards packets in times of
contention.  So, if you don't have contention, you don't need it.  IF
you have 300 people and 4meg of data all fighting for that t1, it makes
a world of difference.

-----Original Message-----
From: Bill Woodcock [mailto:woody at pch.net] 
Sent: Monday, February 10, 2003 1:28 PM
To: Charles Youse
Cc: nanog at nanog.org
Subject: RE: VoIP QOS best practices

    > But I could conceivably have 10+ voice channels over a T-1, I
still
    > don't quite understand how, without prioritizing voice traffic,
the
    > quality won't degrade...

Well, of course it all depends how much other traffic you're trying to
get
through simultaneously.  Your T1 will carry ~170 simultaneous voice
streams with no conflict, but you have to realize that they'll stomp on
your simultaneous TCP data traffic.  But you don't need to protect the
_voice_...

Look, just do it, and you'll see that there aren't any problems in this
area.

                                -Bill