[asterisk-app-dev] Clicks in audio

[Naftoli Gugenheim]

Hi, I have an IVR that uses FastAGI, currently running on asterisk 13 (via
the cleardevice/docker-cert-asterisk13-ubuntu docker image).

The problem: In between playing audio files there is an audible click. I'm
not sure if somehow the audio files themselves contain clicks and for some
reason I don't notice when playing them without asterisk but over the phone
they're magnified, if it's a codec issue, if I'm doing something the wrong
way, or what. Any help is greatly appreciated!

Here is an illustration of what I mean, generated using a call recording
app on my phone:
https://drive.google.com/open?id=0B2SmgnDyV1aETDZrdnJBTU82RGc

Here are the files from the server that it uses:
https://drive.google.com/open?id=0B2SmgnDyV1aEWGNJYy13OGZMTUU

I'm not sure why I have both .wav and .sln files.

Here is some information from the asterisk CLI:


ubuntu at chavrusa-main:~$ docker-compose exec asterisk asterisk -r
Asterisk certified/13.1-cert4, Copyright (C) 1999 - 2014, Digium, Inc. and
others.
Created by Mark Spencer <markster at digium.com>
Asterisk comes with ABSOLUTELY NO WARRANTY; type 'core show warranty' for
details.
This is free software, with components licensed under the GNU General Public
License version 2 and other licenses; you are welcome to redistribute it
under
certain conditions. Type 'core show license' for details.
=========================================================================
Connected to Asterisk certified/13.1-cert4 currently running on
9c5c45693e10 (pid = 17)
9c5c45693e10*CLI> core show version
Asterisk certified/13.1-cert4 built by root @ 2dcc79fb8a1e on a x86_64
running Linux on 2016-03-03 08:25:13 UTC
9c5c45693e10*CLI> core show file formats
Format     Name       Extensions
------     ----       ----------
siren7     siren7     siren7
g719       g719       g719
h264       h264       h264
siren14    siren14    siren14
h263       h263       h263
gsm        gsm        gsm
gsm        wav49      WAV|wav49
ilbc       iLBC       ilbc
slin192    sln192     sln192
slin96     sln96      sln96
slin48     sln48      sln48
slin44     sln44      sln44
slin32     sln32      sln32
slin24     sln24      sln24
slin16     sln16      sln16
slin12     sln12      sln12
slin       sln        sln|raw
slin16     wav16      wav16
slin       wav        wav
g723       g723sf     g723|g723sf
g729       g729       g729
g726       g726-16    g726-16
g726       g726-24    g726-24
g726       g726-32    g726-32
g726       g726-40    g726-40
g722       g722       g722
ulaw       au         au
alaw       alaw       alaw|al|alw
ulaw       pcm        pcm|ulaw|ul|mu|ulw
29 file formats registered.
9c5c45693e10*CLI> core show codecs audio
Disclaimer: this command is for informational purposes only.
It does not indicate anything about your configuration.
      ID  TYPE     NAME DESCRIPTION
-----------------------------------------------------------------------------------
       5 audio     g726 (G.726 RFC3551)
       3 audio     alaw (G.711 a-law)
       1 audio     g723 (G.723.1)
      19 audio    speex (SpeeX)
      20 audio    speex (SpeeX 16khz)
      21 audio    speex (SpeeX 32khz)
      23 audio     g722 (G722)
       7 audio    adpcm (Dialogic ADPCM)
      24 audio   siren7 (ITU G.722.1 (Siren7, licensed from Polycom))
      27 audio     g719 (ITU G.719)
      18 audio     g729 (G.729A)
       8 audio     slin (16 bit Signed Linear PCM)
       9 audio     slin (16 bit Signed Linear PCM (12kHz))
      10 audio     slin (16 bit Signed Linear PCM (16kHz))
      11 audio     slin (16 bit Signed Linear PCM (24kHz))
      12 audio     slin (16 bit Signed Linear PCM (32kHz))
      13 audio     slin (16 bit Signed Linear PCM (44kHz))
      14 audio     slin (16 bit Signed Linear PCM (48kHz))
      15 audio     slin (16 bit Signed Linear PCM (96kHz))
      16 audio     slin (16 bit Signed Linear PCM (192kHz))
       2 audio     ulaw (G.711 u-law)
      17 audio    lpc10 (LPC10)
      26 audio  testlaw (G.711 test-law)
      39 audio     none (<Null> codec)
      25 audio  siren14 (ITU G.722.1 Annex C, (Siren14, licensed from
Polycom))
       6 audio g726aal2 (G.726 AAL2)
       4 audio      gsm (GSM)
      22 audio     ilbc (iLBC)
      28 audio     opus (Opus Codec)
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