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Comment: added sip resource

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Sometimes it's difficult to find the latest RFC for a certain parameter.
Search in the following list to find the right placebuild your SIP knowledge:

http://www.iana.org/assignments/sip-parameters

http://www.voip-info.org/wiki/view/SIP+Trunking

http://www.whichvoip.com/voip/sip-trunking-providers.htm