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dmine45 last won the day on January 11 2018

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About dmine45

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  1. Replying to my own old thread... Looks like more 4ESSes have been replaces with N4E systems. Found this link that used Mark Cuccia's old 4ESS list and is being updated. I need to add a few to this list myself.
  2. How are you even able to call out from OSPSes these days? A couple of years ago AT&T got rid of their calling cards, so I haven't been able to explore OSPS systems like I used to. Unless you still managed to keep a working card somehow? And are you using the CVS technique to get to them or something else?
  3. I've seen a few, still as of May 2017. Saw one in former Commonwealth Tel. territory (now Frontier) in northeastern Pennsylvania (NPA 570). Sadly only a few of the phones still around are working, and those who are working are only sort of working (static, muffled sound, etc.). In other words, not maintained by the local techs - just left to pretty much rot in place. Full CO controlled, not a COCOT in any way. Up until about 2013 was still able to do intra-LATA long distance, but I think Verizon finally killed that off. Here's a pic of two from my last trip up to NE PA.
  4. From what I heard several years ago, the later 4ESS switches that were installed in the mid to late 90s were of a newer generation than those from 1976 to the late 80s. And yes, some of these switches are 40 years old!! But as TP said, over time I bet most of the guts have been replaced (though I do wonder about the announcement machines - some of which are quite broken!). But I think to say relevant, AT&T like a lot of other telcos are going VoIP. I know Verizon basically runs it's old school POTS TDM network and a VoIP network in parallel with gateways to cross connect the two worlds as necessary. Yeah, AT&T has introduced DMS-250, 5ESS, etc. into the long distance network, but the venerable 4ESS is still the backbone. Just curious what their strategy is to play in a mixed TDM and IP environment moving forward.
  5. That's a cool find. Thanks for sharing. I'll have to explore these soon.
  6. Mind if I ask who this provider is and if they're willing to sell service like that? Or did they do you a favor and provide you with a special sevice? I'm on a landline VOIP provider and wish I could do 101-xxxx FGD testing. Only place that I can do a limited amount of that is at work on an old fashioned DMS-100 Centrex.
  7. Interesting. That's one of the tandems in Houston, TX. Mind if I ask you what you dialed to reach it?
  8. I go all over the US for work and vacation, and when I do I like to see how the local network homes on various tandems (AT&T, MCI, Sprint) when I can. I like to do it from landlines and cellphones since both route differently. I also do this with VOIP carriers since often times they dump you on the POTS network at various places, and this can either be static or dynamic. (Can you say Tandem round robin?) Often times calls from landline, cellular or VOIP go to the newer "edge switches" that are in the format of NPA-xL (like 412-9L). I believe most of these are 5ESS based. But most of the time you can reach a 4ESS in the format of xxx-T. Anyhow, I was in a very rural place in Wyoming in May while on vacation. It was a rest stop in the middle of nowhere. The rest stop used to have a pay phone (you can tell it was there and removed), but they did have a microcell for Verizon Wireless (obviously fed by DSL). Doing my test for AT&T, it did the round robin as I suspected (some sort of VOIP backhaul) and I came up on 088-T a few times. That *used* to be the AT&T tandem for San Diego. They retired the 4ESS a few years ago, but now it comes up in the "new" voice that AT&T is using for the new generation "N4E" system.The N4E uses the old 4ESS software hosted in a virtual environment in newer hardware (lot smaller footprint and more in tune with modern packet switching). Sure enough, I was in San Diego last week and tried it from a COCOT. Yup, they do have a new N4E and has the new voice on the trailer. So I'm wondering how many of the existing 4ESS systems will be replaced by N4E systems? I also wonder how many 4ESS and N4E systems are out there. I found a N4E in Scottsdale, AZ (NPA 480) not too long ago. Haven't explored what else is new out there recently.
  9. Jman - Glad you went. I took the opportunity in 2005 when my brother who lives in Tacoma got remarried. Of course nobody but me wanted to visit. So glad I went - and I want to go back! Next time I'm in the PNW I'll make it an effort to go!
  10. As I recall, the AT&T 4ESS tandems where that recording resides are regionally based. 074-T is Philadelphia and serves the mid-Atlantic region. I live in that area and I home on that as well.
  11. Gonna say, Evan Doorbell did a segment on Cognitronics and numbers stations, and those were well before 1987. Back in the 80s I listened to a lot of shortwave and they were around in the early 80s when I was first scanning the bands
  12. I wish I had obtained recordings as well. I didn't know which was going to be the last one. I thought it could have been one of the Savannah, GA switches. I sort of lost interest in all of this when a good friend of mine passed away back in 2014 (TP knows who I'm talking about) who absolutely tracked every last 1AESS until he died. I mean tracked everything about them. You may still find his old posts on the Internet. Then in the summer of 2016 I asked a contact that he knew about the status of the 1As. He told me only a handful were left. So I started to keep track again. But as time went on, I sort of got bored again. I shouldn't have dropped my guard. But as others have said, an era is over. No more steps, crossbars or "electronically controlled analog switches" anymore.
  13. For me it's 005-T (Washington, DC 4ESS). So I assume it's not necessarily your local tandem, but the regional tandem that has that has that recording. (Sort of what they do with 800 numbers that are no longer in service) Also tried it on MagicCrap and I got 010-T (Baltimore, MD)
  14. I need to visit there again as well. Glad you were able to make recordings of the switch sounds.
  15. So I take it that Odessa was the last 1AESS office? So what was the date that it went down? June 1st? Another notch in the change of technology. The last crossbar offices went away in the US circa 1993, the last step or XY office in the US was around 1999, Canada was 2001 (Nates, Quebec). And it looks like the last 1AESS was Odessa, TX in May or June 2017. RIP old switching systems.