IPTables Firewall Configuration for SIP/VoIP on CentOS Rackspace Cloud March 14, 2014 firewall iptables SIP VoIP +
How To: Asterisk Sip or VOIP Debug and TCPDump w/ Ngrep Tutorial March 14, 2014 Asterisk debug ngrep tcpdump VoIP +
Installing our First VoIP Server (Asterisk 1.8) March 09, 2014 asterisk 1.8 CentOS OpenSource Server SIP telephony VoIP +