January 27, 2011
Adopting a SIP trunking service is not a simple process. A profusion of
choices and decisions awaits you on pricing, service availability,
capacity, service level agreements, and much more. That's in addition to
selecting the equipment you'll need like SIP-enabled IP-PBXs, session
border controllers as well as sizing your SIP trunking implementation
correctly.
In fact you may experience a sense of déjà vu as many of the questions
you need to ask are those that you already asked (or should have asked!)
when replacing TDM with VoIP all those years ago. It's not surprising
therefore, that many enterprises need support and guidance. This white
paper discusses one of the critical considerations of migrating from TDM
to SIP trunks − that of understanding current call activity and volumes
across your existing VoIP environment.
The good news is that now you are a few years down the VoIP track, you
are in a much better position to understand what to look for and how to
find answers. You should now have the tools to analyze and properly
assess your VoIP environment, providing valuable information that will
position you well to design and negotiate the best rates, contract and
service level agreements with carriers and service providers.
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In early implementation stages of VoIP, the primary architecture was to use VoIP for on-net (intracompany) calls and then to hand off everything to the PSTN via TDM-based trunks.
Now we're ready to move forward at "warp speed" into an IP-only environment. And a key component of this is to use SIP as the primary interface to IP-based telephony providers.
This paper provides a great discussion of the processes, challenges, and solutions for making a smooth transition to SIP-Based trunking. Highly recommended!