[VoiceOps] Maximum latency

Matthew M. Gamble mgamble at thoughtfire.ca
Wed Mar 22 14:03:41 EDT 2017

The ITU-T recommendation is that “up to 150 ms mouth-to-ear delay can be tolerated by the human ear with virtually no quality loss” and in my experience, that’s held true.  They are definitely going to notice the delay.

From: VoiceOps <voiceops-bounces at voiceops.org> on behalf of Carlos Alvarez <caalvarez at gmail.com>
Date: Wednesday, March 22, 2017 at 1:59 PM
To: "voiceops at voiceops.org" <voiceops at voiceops.org>
Subject: [VoiceOps] Maximum latency

One of our larger customers is about to launch a new call center in Malaysia.  The connection there is fast, the trace looks surprisingly clean and short, but latency is consistently at 239-245ms.  We've never knowingly had a connection over 130ms.  Does anyone have experiences, good or bad, with latency approaching a quarter second?  The jitter level seems fine, so I believe they'll just have a delay but decent call quality.

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