Out of idle IAX2 threads
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If you seen something similiar like this in asterisk CLI: ^@^MESC[Kmoosehead*CLI> ^M[Oct 24 22:56:55] ESC[1;33;40mNOTICEESC[0;37;40m[6404]: ESC[1;37;40mchan_iax2.cESC[0;37;40m:ESC[1;37;40m6691ESC[0;37;40m ESC[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 . Don't forget to do /etc/initd./asterisk reload after any changes in /etc/asterisk/*.conf files!