Bug#481702: asterisk: Call quality on IAX significantly worse than SIP

[Lionel Elie Mamane]

Package: asterisk
Version: 1:1.4.19.1~dfsg-1
Severity: normal

For calls between the same two asterisk boxes, IAX audio is choppy (a
fraction of second of sudden silence every few seconds) ("iax2 show
netstats" shows lost packets), but SIP audio is OK. Same audio codec is
being used. (The call is mapped to Playback()/IAX/SIP on one box and to
a zap channel (junghanns.net QuadBRI) on the other box. The audio that
is choppy is on the zap channel. About every other scenario gives good
audio:

 ZAP-boxA-Playback()
 ZAP-boxA-SIP-boxB

 ekiga behind boxA (which is a NAT router)-SIP-boxB
 ekiga behind boxA (which is a NAT router)-SIP-boxB-SIP-boxA (canreinvite=no)

this scenario is also choppy:

 ekiga behind boxA-SIP-boxB-IAX-boxA-ZAP

That is the audio from ekiga to the zap channel is choppy, but the audio
from zap to ekiga is not.


I checked that this is not solved by 1.4.19.2. It did not happen before
I upgraded to 1.4.19.


-- System Information:
Debian Release: 4.0
  APT prefers stable
  APT policy: (600, 'stable'), (300, 'testing'), (200, 'unstable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.25-2-686
Locale: LANG=fr_LU.UTF-8, LC_CTYPE=fr_LU.UTF-8 (charmap=UTF-8)

Versions of packages asterisk depends on:
ii  adduser                3.102             Add and remove users and groups
ii  asterisk-config        1:1.4.19.1~dfsg-1 Configuration files for Asterisk
ii  asterisk-sounds-main   1:1.4.19.1~dfsg-1 Core Sound files for Asterisk (Eng
ii  libasound2             1.0.16-2          ALSA library
ii  libc-client2007        7:2007~dfsg-1     UW c-client library for mail proto
ii  libc6                  2.7-10            GNU C Library: Shared libraries
ii  libcap1                1:1.10-14         support for getting/setting POSIX.
ii  libct3                 0.63-3.2          libraries for connecting to MS SQL
ii  libcurl3               7.18.1-1          Multi-protocol file transfer libra
ii  libgcc1                1:4.1.1-21        GCC support library
ii  libgsm1                1.0.12-1          Shared libraries for GSM speech co
ii  libiksemel3            1.2-3             C library for the Jabber IM platfo
ii  libncurses5            5.6+20080308-1    Shared libraries for terminal hand
ii  libnewt0.52            0.52.2-10         Not Erik's Windowing Toolkit - tex
ii  libogg0                1.1.3-2           Ogg Bitstream Library
ii  libpopt0               1.10-3            lib for parsing cmdline parameters
ii  libpq5                 8.3.1-1           PostgreSQL C client library
ii  libpri1.0              1.4.3-1           Primary Rate ISDN specification li
ii  libradiusclient-ng2    0.5.3-2           Enhanced RADIUS client library
ii  libsnmp15              5.4.1~dfsg-6      SNMP (Simple Network Management Pr
ii  libspeex1              1.2~beta3.2-1     The Speex codec runtime library
ii  libspeexdsp1           1.2~beta3.2-1     The Speex extended runtime library
ii  libsqlite0             2.8.17-2          SQLite shared library
ii  libssl0.9.8            0.9.8g-10         SSL shared libraries
ii  libstdc++6             4.1.1-21          The GNU Standard C++ Library v3
ii  libtonezone1           1:1.4.10.1~dfsg-1 tonezone library (runtime)
ii  libvorbis0a            1.1.2.dfsg-1.3    The Vorbis General Audio Compressi
ii  libvorbisenc2          1.1.2.dfsg-1.3    The Vorbis General Audio Compressi
ii  libvpb0                4.2.32-1          Voicetronix telephony hardware use
ii  unixodbc               2.2.11-13         ODBC tools libraries
ii  zlib1g                 1:1.2.3.3.dfsg-12 compression library - runtime

asterisk recommends no packages.

-- no debconf information