Developing SIP 
I am currently on a project, experiencing the joy (and some bites) of fully concurrent software development. Writing call queue management components for a new call center implementation. One thing i have been introduced to is SIP.

Had an interesting experience so far. Took a while to get my head around the design and how to go about implementing code on it. And since i am able to start using it... the cracks are starting to show.

A protocol so simple, yet it can get horribly abused by SIP based servers, loading messages with implementation specific data...making reuse damn near impossible. Unfortunately plans are in motion to drop the current SIP server, and now I have to basically reverse engineer the business components to be able to use it in a JSR289 container. But i am not too bothered about it, kinda like re-engineering software, always gives me chance to write better improved code.

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