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.