Some comments from an IT guy that got sucked in telecom business. Which was painful and cost me a lot, but things are improving now.
IT guys know jack s**t about cabling. True. Not something that is (properly) taught in schools, and not something you can (properly) learn on your own over the internet, in part because the stupid standards are not available online for a reasonable cost (that is, free, as are laws, standards required by laws being de facto laws). It takes a lot of hands-on field experience too.
Most IT guys lack knowledge about electricity and electronics. Sad and true. To the point that many of them can't even diagnose/fix a hardware problem on a computer.
Many IT guys lack knowledge on networking issues. It takes a lot of field experience on hardware and setups they won't have at home to play with.
Most IT guys have to deal with people of any age, profession and experience that think they know computers because they use one everyday (the worst offenders being in medical professions). So they have to be assertive, which is not always well perceived, but this is the only way for them to get some actual job done.
Competent experienced IT guys know more than telecom guys about server room design/management and will keep them in check to avoid costly (in terms of maintenance) disasters initiated by old-school telecom geniuses. No, we don't want a huge BIX on a plywood in the corner to cross-connect all our racks. Sure, you certainly always have done it this way for 30 years. No it's not "the" standard. OK now, let me call the engineer to make this clear and have him explain it to you again.
Many telecom guys have issues sharing knowledge with outsiders (and sometimes even colleagues) and explaining what they do and why they do it this way. They tend to be on the defensive, which causes them to be perceived as "square". Or maybe it's for job protection. Anyway, the IT guy is not always the cause for the lack of communication and understanding.
About "reliability is not what it used to be". Ever used a cell phone fifteen years ago? That's where VoIP is now, with way better audio quality. Also in my place I have seen DSL connections stay up even though voice service on the same trunk was degraded to the point of being unusable because humidity/corrosion occured on the line somewhere between the customer and the CO. The point is, circuit-switched networks are not actually as reliable as people think they are. Also, analog vs. digital = analog degrades progressively over time, digital works and then suddenly doesn't work at all if the signal quality gets low enough.
About the downtimes. 99% is 14 minutes 24 seconds of downtime per 24 hours. If your IT guy can't do better with his systems, show him the door, seriously. A reboot a month for 4m30s gets you 99.99% uptime, and if you only do that once a year, say, for updates, you get over 99.999%. Looks good enough to me, as I am pretty sure many "carrier-grade" networks actually don't achieve that if averaged over enough years. And it is easier to implement redundancy with VoIP systems than TDM systems.
Modern numeric phones are actually computers and their user interfaces are too often poorly designed, which is a problem in all IT fields because they don't spend the necessary resources designing and properly validating user interfaces. This is why the iPhone is such a hit. On the other hand, star codes, tones and voicemail menus are not exactly user friendly either.
... and the real reason you see so many IT guys in your field now:
IT guys are into packet switching. Telecom guys are into circuit switching. Packet switching has finally won (and this causes different, not worse, issues) and IT guys were already in charge of the network, and now they have to do voice as well as data. Circuit switching folks now blame IT staff for all the shortcomings of migrating to packet switching, and stay silent about the advantages. As they don't know anything about protocols (even ISDN...) above electrical levels (and even then, sometimes the knowledge is only in the test tools they have), they won't help anyway.
So basically telecom as it used to be is going away. On one side you will have network folks from IT, because in the end they will have to support these systems anyway. And the folks who lay out cables are becoming something like a specialized kind of electricians (actual electricians try to get into this sometimes, and the result is not pretty). And it will be increasingly unlikely to find a guy that is qualified to install cabled infrastructure and also setup data networks and phone systems. Time to get used to it and learn to work together.
--
A(PS|CI)S-SMEC
IT consultant
Canada / Quebec City area