What about this course?
Module 07: Gateways & Trunks - More than you knew possible about ISDN, H.323, MGCP, SIP)
Instructor for this course
This course is composed by the following modules
Module 7.0: Gateways and Trunks
Module 7.1: SIP Trunk
Module 7.2: SIP Trunk cont'd
Module 7.3: H.323 Gateway
Module 7.4: MGCP Gateway
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