Written by Graham Francis. Graham Francis is the CEO of Vocale Ltd which owns and operates The SIP School™. The SIP School™ is a SIP training and SSCA™ certification service endorsed and used by companies such as Mitel, Panasonic, Ingate, AudioCodes, Brekeke etc. along with organisations such as the TIA and Bicsi. The course runs from SIP messaging and SIP Servers, through Security, Firewalls, NAT, Troubleshooting, Trunking, ENUM, onto SIP in Unified Communications with lots more not mentioned here..For course outlines, demos and even some free training! Please visit www.thesipschool.com.

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