Out of idle IAX2 threads
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If you see something similiar like this in asterisk CLI:
[*CLI> [Oct 24 22:56:55] ESC[1;33;40mNOTICEESC[0;37;40m[6404]: ESC[1;37;40mchan_iax2.c ESC[0;37;40m:ESC[1;37;40m6691ESC[0;37;40mESC[1;37;40msocket_readESC[0;37;40m: ^@Out of idle IAX2 threads for I/O, pausing!
That means You need increase iaxthreadcount & iaxmaxthreadcount values in /etc/asterisk/iax.conf .
Defaults for these to variables are ;
iaxthreadcount = 10 iaxmaxthreadcount = 100
Change to something 'bigger'
iaxthreadcount = 100 iaxmaxthreadcount = 1000
That should be fine, if you still see same error, try increasing values for these two variables.
Don't forget to do
/etc/initd./asterisk reload
after that.