[asterisk-users] CSipSimple audio issue with DAHDI/IAX2 calls

[Anthony Messina]

I've just connected my new Android (Motorola RAZR) phone to Asterisk
using CSipSimple and have discovered that on any call between CSipSimple
and an Asterisk DAHDI or IAX2 channel, the 'other' end of the call will
hear a rhythmic tapping as if my voice stream is being chopped up in
equal parts about every 500ms or so. I can always hear the remote party
without issue, regardless of the channel type.

The issue occurs only on connections to DAHDI channels (even those that
don't pass through the PSTN), and IAX2 connections to remote Asterisk
servers.

This issue occurs whether I am using WiFi, 3G or 4G connections on the
Android.

This does NOT occur on any SIP channels, local to my Asterisk box, or to
others.

I've investigated changing just about every setting on the Android with
no resolution.  It seems like some sort of timing issue and is strange
to me that this issue is confined to DAHDI and IAX2 channels, but I'm no
expert.

I have tested using only res_timing_dadhi.so since I have the card, but
that did not help either.

Would anyone be willing to point me in the right direction for resolving
this issue?  Please let me know if any more information is required.
Thanks in advance.  -A


I am currently using the following on a Fedora 15 x86_64 system:
Asterisk 1.8.7.1 built by mockbuild @ x86-13.phx2.fedoraproject.org on a
x86_64 running Linux on 2011-10-17 21:42:11 UTC

]# cat /proc/dahdi/*
Span 1: WCTDM/4 "Wildcard TDM400P REV I Board 5" (MASTER)

           1 WCTDM/4/0 FXOKS (In use) (EC: OSLEC - INACTIVE)
           2 WCTDM/4/1 FXOKS
           3 WCTDM/4/2 FXSKS (In use) (EC: OSLEC - INACTIVE)


*CLI> module show like timing
Module                         Description      Use Count
res_timing_dahdi.so    DAHDI Timing Interface   0
res_timing_pthread.so  pthread Timing Interface 0
res_timing_timerfd.so  Timerfd Timing Interface 1


*CLI> core show settings

PBX Core settings
-----------------
  Version:                     1.8.7.1
  Build Options:               LOADABLE_MODULES
  Maximum calls:               Not set
  Maximum open file handles:   Not set
  Verbosity:                   3
  Debug level:                 0
  Maximum load average:        0.000000
  Minimum free memory:         0 MB
  Startup time:                10:23:07
  Last reload time:            10:23:07
  System:                      Linux/2.6.32-131.2.1.el6.x86_64 built by
mockbuild on x86_64 2011-10-17 21:42:11 UTC
  Default language:            en
  Language prefix:             Enabled
  User name and group:         /
  Executable includes:         Disabled
  Transcode via SLIN:          Enabled
  Internal timing:             Enabled
  Transmit silence during rec: Disabled
  Generic PLC:                 Enabled

-- 
Anthony - http://messinet.com - http://messinet.com/~amessina/gallery
8F89 5E72 8DF0 BCF0 10BE 9967 92DC 35DC B001 4A4E

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