From: invalid@see.sig.telecom-digest.org   
      
   On 5/21/2022 12:36 PM, Bill Horne wrote:   
   > On 5/19/2022 9:05, Bill Horne wrote:   
   >>> I was talking to an old friend yesterday, and he told me that he's   
   >>> been working from home for a while now, and the conversation turned to   
   >>> ISDN phone service, which I recommend to anyone who can still obtain   
   >>> it.   
   >>>   
   >>> 1. Which states still have tariffs for ISDN BRI lines?   
   >> ...   
      
   ISDN Basic Rate Interface (BRI) is generally no longer available in   
   the US. Verizon and I think ATT long ago gave formal notice of   
   discontinuance or grandfathering. Maybe Qwest, pre-Century, didn't   
   bother, so it may still be on the books there. But few know how to   
   provision it. Many of the switches that provided it (mainly 5ESS and   
   DMS-100 in the US) no longer are in service. It was useful, especially   
   for broadcasters doing remote feeds. It was better than a modem for   
   Internet access, and that's what killed it as it was coming out in the   
   early 1990s -- the Bells hated the Internet, which broke their   
   locality-based business model, and while they couldn't attack modem   
   users per se, they could at least attack the most obvious Internet   
   user group, non-Centrex ISDN BRI users. Bell Atlantic l/k/a Verizon   
   was also fanatical in those days about selling Centrex, and saw ISDN   
   BRI as a tool for Centrex feature phones, but that was about it. That   
   business has faded out too.   
      
   ISDN Primary Rate Interface (PRI), which runs over a DS-1 ("T1")   
   channel, is still out there, though again its number are in   
   decline. It is a very good trunk interface for PBX systems, and many   
   different 1995-2010 vintage switching systems support it, as it   
   handled the dial-up era's modem pools. But most newer systems use SIP   
   trunks instead. PRI has higher quality of service than SIP/RTP/IP, but   
   the industry has moved away from it, as the higher-volume IP services   
   usually have a lower price tag.   
      
   --   
   Fred R. Goldstein      k1io     fred "at" ionary.com   
     +1 617 795 2701   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)