Since its introduction in 1998, session initiation protocol, or SIP, has been the standard foundation for voice over the internet infrastructure. With the purpose of maintaining flexibility for VoIP providers and their networks, it has grown exponentially in both size and scope among the telco community. This has turned into a double edge sword of sorts, as the evolution of SIP means new and exciting expansions, but few are designed for compatibility with one another.

Back in the early days of SIP, this wasn’t an issue. Originally the Internet Engineering Task Force monitored and approved SIP extensions, as it didn’t have the widespread popularity it does today. But now, as providers continue to add their own flair to SIP to best provide unique services, there arises the problem of a lack of interoperability.

The good news? Providers are finally working together to establish a set list of guidelines for their SIP offerings, so they may continue to develop innovative expansions to SIP, while maintaining interoperability.

In this article, published in RCR Wireless, I discuss the history of SIP and how despite humble beginnings, it has grown to be the bedrock of VoIP telecommunications. I also take a look at the challenges faced by providers as they seek to set the record straight on what exactly constitutes SIP trunking. Check out the full thing here: Reader Forum: Simplifying SIP

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