Bug#482997: asterisk: Extremely choppy sound and high CPU usage

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Package: asterisk
Version: 1:1.2.13~dfsg-2etch4
Severity: normal

When making calls involving IAX2 channels, sound is extremely choppy
and CPU usage spikes.

Messages on the CLI indicate problems while channels are active:
WARNING[12301]: File chan_iax2.c, Line 4436 (socket_read): Received
mini frame before first full voice frame

IAX2 registry entries become unregistered
IAX2 peers become UNREACHABLE

This problem seems to be caused by the 2etch4 update, since it works
fine in 2etch3 (see http://www.debian.org/security/2008/dsa-1563).

To replicate:
Set asterisk console debug and verbose to 100
SIP phones on machine A 
via IAX2 trunk to machine B
via IAX2 trunk back to meetme room on machine A

Creating 5-10 simultaneous calls should reveal the problem.
-- System Information:
Debian Release: 4.0
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-6-686
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)

Versions of packages asterisk depends on:
ii  adduser             3.102                Add and remove users and groups
ii  asterisk-classic    1:1.2.13~dfsg-2etch4 Open Source Private Branch Exchang

asterisk recommends no packages.

-- no debconf information