Question : Is there a difference in definition between a SIP and a SIP-T? Is SIP-T called SIP Trunking?

sip trunking

Best answer:

Answer by Charles B
There you go:

http://www.sipcenter.com/sip.nsf/html/SIGTRAN+and+SIP-T

http://www.cisco.com/univercd/cc/td/doc/product/access/sc/rel9/mgcfm/941fm/fmsipt.htm