The endpoint receiving them can also have an impact.
FWIW, I can reproduce it both through an actual phone to a DID on Flowroute, and a sip phone running on my laptop connecting to a locally running asterisk.
Asterisk doesn't
generally generate media on its own. This means that if you play a sound
file, wait, play a sound file, etc, there is no silence generated in
that gap period. The endpoint may not be liking the resulting RTP
stream, resulting in it getting confused when the sound file changes and
causing an actual audio manifestation.
Does "wait" include doing an AGI "wait for digit"?
This does happen sometimes. For instance if I'm playing two phrases, sometimes I want a 250ms or 500ms pause in between, and if it's part of a prompt that can be interrupted I use WaitForDigit (otherwise I currently just use Thread.sleep)
But it does not seem like that's where it's happening. Mostly I'm playing a bunch of sound files one right after the other. (Well, there's technically some amount of time spent in getting the response from asterisk over FastAGI and sending the next command... but one would hope that's negligible...)
--
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org
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