[cisco-voip] Silly question...

Jonathan Charles jonvoip at gmail.com
Fri Feb 29 18:10:48 EST 2008


Maybe I should be more clear.

What is the Cisco-recommended best-practice for maximum round trip
delay for a Cisco IP Telephony deployment.

And the answer is apparently 150ms each way... that is still nuts.

I am wondering why most of us think it was 150ms round trip... this
isn't isolated to a few of us, I asked all of the engineers I work
with and every one of them (including two CCIEs) told me it was 150ms
round trip....

Now, I found a doc on Cisco's website saying 150ms each way... so, 300ms...



Jonathan

On Fri, Feb 29, 2008 at 5:05 PM, Bill Woodcock <woody at pch.net> wrote:
>     > OK, here's the thing.
>     > This morning, if you had asked me this question, I would have bet
>     > serious amounts of cash that the MAXIMUM ROUND TRIP DELAY was 150ms.
>     > Now, I am seeing that it is ONE WAY, with a maximum of 300ms round
>     > trip... that is insane.
>
>  I've been on triple-satellite-hop calls with more than four seconds of
>  delay.  And obviously, astronauts and cosmonauts have no trouble phoning
>  home.  It's all a matter of conversational turn-taking.  People who are
>  good at it have no problem, while people who are nervous or impatient
>  can't usually deal with it.
>
>                                 -Bill
>
>


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