Bunch of clues, no great answers. What Stephan wants is Modem over VoIP https://en.wikipedia.org/wiki/Modem_over_VoIP We (System Source, Baltimore County Maryland) gave notice to our PRI vendor on 10/22 (30 day cancellation) so I have 23 channels which can support full bandwidth modems until cutoff on November 22 (Here in Baltimore) We have been running on pure VOIP for the past few weeks. IF you are testing locally, I am decommissioning our Atlas Adtran 550 which has about 16 analog ports (FXS, and about 8 FXO ports). They will be useless after the PRI cutoff for connection to the outside world in a few weeks, but I'm happy to help until the PRI is turned off. You can also use it locally to emulate a phone company. At work, I have one POTS line left (one of the communications channels on our commercial fire alarm systems must be POTS ) I can't leave it disconnected for long, but is available for light testing during the day. I have to put the building fire alarm in test mode. At home still have a POTS line. It is unused.... In our museum, I have kept one of the Livingston Port Masters. We used to have it hooked up to PRI's to provide dial-up Internet access in the 90s. Have not fired it up in a long time. Again, you can call across channels. It has the modems built in (56K) Lastly, we were able to get two AT&T picture phones working after quite a bit of fussing locally using a GrandStream 8 port ATA and the G.711 protocol. It mostly works. Bob Roswell ---Original Message----- From: vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org> On Behalf Of Stephen A Edwards via vcf-midatlantic Sent: Tuesday, November 7, 2023 5:43 PM To: vcf-midatlantic@lists.vcfed.org Cc: Stephen A Edwards <sedwards@cs.columbia.edu> Subject: [EXTERNAL] [vcf-midatlantic] OT: Landline in NY/NJ Area I'm trying to get a computer device c. 1999 to "phone home": it includes a relatively fast voiceband modem (I'm not sure of the exact speed) that needs to be connected to a POTS landline (i.e., RJ-11). It's not a fax modem, but it's playing at least as many tricks as a fax modem. I've currently tried about 6 different variants of VoIP/cable modems and they all don't work to varying degrees. I've tried seemingly every setting (codec -- I'm using the recommended G117u, jitter control, RTP packet size, echo cancellation off, etc.) on a Cisco SPA112 ATA I borrowed and it connects for a minute or two before giving up: the best behavior I've observed. I'm convinced that it won't work without connection to a traditional landline, i.e., that's connected to the PSTN through a T1 or equivalent circuit-switched, synchronous connection. Is there anybody in the New York City/New Jersey area who has an old-school landline (i.e., not from a cable modem or equivalent) that I could experiment with for an hour or so? Contact me off-list