Aging is a pain in the neck! Literally and figuratively! I'm trying to figure out the benefits of getting older and I'm not going with a very long list. You built a library of experience, I guess that must count for something. No new generation of telecommunications professionals who have no idea what a crossbar switch is, but what what. Nobody is really buggy or missing tissues. On the old "Bell System" (I've really dated myself now, as demography Google my readers tell me they were born after the collapse), there was a specific regulation against the interconnection of analog telephone lines to a PBX. Now part of this restriction was the Bell System is a group of anti-competitive jerks, but there were technical problems for not doing real well. Analog lines are more useful in man communications man. The issue here is the concept of "supervision of the answer" and "calling or called party disconnect.
When you answer the phone call at home, the monitoring of response is actually his ear. You can "hear" the other party. Yes, there is a change line or change in voltage, but if a two wire loop is nothing like being a trunk line. For this reason we use the trunks to interconnect the machines to machines. Everybody's going to make a phone call outside and find someone on the line? Great example of "glow" the concept of a call in the call of the same So in order to grab an outside call. Analog lines are good for key systems with a wink and flashing line keys around the world show that is what the line, but they are a real nuisance in a PBX system.
Answer supervision is poor if it exists and glare can be a real problem. Lanza a pair of Centrex lines into the mix and get some real extra fun features. Nothing like having analog lines connected to your PBX with feature treatments did not know. It's always the phone when the telephone companies before VM picks up his ShoreTel VM system does! As a rule you like to have one analog line 911 and a site for a power failure, but the idea of running a ShoreTel PBX with a shelf full of analog lines, actually makes me ill. Judas Grunt, is the 21st century already! How do you spell SIP?
ShoreTel does a reasonably good job with analog lines, given the disadvantage they have on the real scope of supervision of reply, ShoreTel etc. actually happens off hook in these lines at regular intervals. If you do not "listen" dial tone, which marks the line out of service. If you're really blade, there is a trick to record the sound made when the line is "off the hook" so you can get the wav file and play it locally. A great lifesaver when you are in Portland and troubleshooting a local loop at a remote site on the outskirts Minute, ND, and nobody in the office.
I'm surprised you still have analogue PBX systems, but while doing so, it might also learn to deal with them
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That ringing in your ears is called Tinnitus