[VoiceOps] Virtualized SBC

Alex Balashov abalashov at evaristesys.com
Wed Apr 6 22:16:01 EDT 2016

That's just it. SBCs are a terrible example of "NFV" because SBCs do not 
actually perform a "network function" of the sort that begs to be 
decoupled and abstracted in the way that NFV and SDN envisions, like 
software-defined switches and routers. The idea that the SBC is a kind 
of "voice firewall" is a fiction pushed by the marketing departments of 
SBC vendors.

What is an SBC? It's a SIP B2BUA with some sort of provisioning and 
management interface. If you're lucky, there are some ASICs or 
kernel-mode crypto, transcoding and/or packet forwarding functions. It's 
an application-layer construct, a giant softphone touted as a condom 
that must go over innocent and vulnerable "softswitches". It's not a 
"network" element, but it looks much better on Visio diagrams to depict 
it as one.

On 04/06/2016 09:58 PM, Ryan Delgrosso wrote:

> They have more than a buzzword for this, its a whole movement.
> Realistically NFV encompasses more than just raw virtualization its also
> elastic capacity and the orchestration layer to manage it. The only
> problem is most vendors have only accomplished the virtualization part
> and are still sorting out the orchestration while trumpeting NFV.
> On 4/6/2016 6:45 PM, Alex Balashov wrote:
>> So, it's news to the Bellhead world that most "SBCs" run on commodity
>> pizza boxes & OSs that are branded by the vendor and resold at large
>> markups, and that the software can be separated from the hardware and
>> executed on other pizza boxes, and, indeed, inside VMs? And they have
>> a whole buzzword for this?
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Alex Balashov | Principal | Evariste Systems LLC
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United States

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