Constructing H.323 stacks for VoIP designs

摘要

A voice-over-IP (VoIP) application developed using a primitive-based H.323 tack is not a trivial endeavour. Creating a robust application using such a stack involves countless hours studying ambiguous standards and complex state diagrams. Those considering building an H.323 stack in-house should reconsider. A compliant stack could take years of engineering resources, not to mention the knowledge and learning curve necessary to overcome these complex standards. This article explores the issues, ambiguities, and headaches of developing an H.323-compliant stack and VoIP application. Specific examples include the implementation of a procedure and defining a primitive to show what is necessary to build an application using a primitive-based interface and an alternative, simplistic interface.