Posts Tagged ‘sip’


Having passed the CCIE Voice 10 years ago, and having taught on the technologies surrounding both Voice and Collaboration ever since, one might think that the exam would be easy to pass. I can assure you that no matter how much you know, no CCIE exam is easy to pass. Cisco doesn’t allow them to be. Every CCIE track requires hard work and preparation, even if it may, at first glance, seem somewhat of a repeat of things you already know. You may ask since I had the CCIE Voice already, why I didn’t simply take the Collaboration Written exam and convert my cert to a CCIE Collaboration? The answer I think is pretty straightforward – it’s the challenge!! Seeing if you still have it 10 years later. Seeing if what you’ve been teaching your students for 10 years is still up to par and still relevant. To take you back to when I passed CCIE Voice ten years ago, the track was literally brand new that year, and Cisco was testing on CallManager version 3.3, SIP wasn’t anywhere to be found, and creating a hunt group meant tweaking Attendant Console to make it do things it shouldn’t ever be expected to do (like work). I’m quite happy to find that I may still have ‘it’ and that my content is right on par and not only relevant on all accounts, but as always goes well above and beyond the minimum of what you need to know to pass the exam, and takes you into the deep inner-workings of the technologies and answers the all of the “why” questions. Bear in mind that we never create content with the singular goal of simply getting you “past” the lab exam (the people that can only barely pass the lab can’t make it past a technical interview in the real world), but rather our focus is making you a true expert whereby, as a byproduct, you do pass the lab exam and quite handily at that. Over the past 10 years I’ve had the pleasure of helping over 1,500 people do just this, and it’s been so enriching in my life to see their professional and personal lives bettered for it. So what took me so long to getting around to sitting for this new exam? Simply put – my schedule. As some of you may know, I’ve been teaching a lot of 2-week CCIE Data Center courses and 2-week CCIE Collaboration courses, as well as working on building all of the Collaboration racks and self-paced learning content, and quite frankly just hadn’t found time in my schedule to get around to preparing to sit for and take the actual new lab exam until just a few weeks ago. So onto more of what you need to know and what it takes to be ready.

CCIE Numero Quatro

It’s quite possible that I may be one of the only people besides Frog that possesses 3 or more CCIE’s, where one of them is not Routing and Switching.

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Many businesses globally – large and small alike – have been converting calls from routing over traditional PSTN carrier trunks – such as E1 & T1 PRI or CAS – to much lower cost, yet still high performance, SIP ITSP (Internet Telephony Service Provider) trunks for years now. INE is no different than your business with regard to this – we have been using SIP trunks in lieu some traditional PSTN calling for years now as well. In fact, in response to a US Federal Communications Commission sub-commitee’s exploration on “PSTN Evolution” in December 2009, a representative from the US carrier AT&T described the traditional circuit-switched PSTN as “relics of a by-gone era”, and said that “Due to technological advances, changes in consumer preference, and market forces, the question is when, not if, POTS service and the PSTN over which it is provided will become obsolete” – source: Reuters [emphasis mine].

The challenge however, becomes that every SIP ITSP carrier has a slightly different way of implementing these sorts of trunks, and each has different provider network equipment that you, the customer, must connect to, and interoperate (properly) with. If you are a large national or multinational business, you may for instance sometimes even connect to two or three different types of provider network equipment, between possibly having multiple contracts with multiple carriers, and even sometimes having to deal with different provider equipment within a single carrier’s network.

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