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AT&T Merlin Phones on Early-2000s VoIP

34.6K views· 1,869 likes· 31:10· Sep 10, 2025

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Bridging the divide between some 1980s AT&T Merlin and 2000s Cisco IP phones. We'll go over each of the phones, do a bunch of infrastructure clean up in the retro rack, and get a Cisco 2821 router acting as a bridge to let us make calls! Cisco IP Phone Setup Video https://youtu.be/uA1VXI7uWLM Check me out on Patreon: https://www.patreon.com/clabretro Music by Karl Casey @ White Bat Audio #netro #retrotech #retrocomputer #networking #cisco #telephony Serial to USB converter: https://amzn.to/4mAXDlJ Rack stuff StarTech Universal Rack Rails: https://amzn.to/404JV1Q StarTech 42U Rack: https://amzn.to/482c3oh StarTech 25U Rack: https://amzn.to/3mEB7hS Tripp Lite SMART1500LCD UPS: https://amzn.to/3KZW3Jw 1U 24 Port Patch Panel: https://amzn.to/3Nm0bFa 1U Brush Panel: https://amzn.to/3mExAA3 1U Rack Shelf: https://amzn.to/3oaDclT Video gear Camera: https://amzn.to/4al3xjA Main mics: https://amzn.to/4dCUuO2 Desk mic: https://amzn.to/3ye8BsV Note: The above are Amazon affiliate links. It doesn't cost you extra, but I'll receive a commission which will help keep the content coming. I only link to things I've personally ordered. 00:00 Merlin and IP Phones 01:52 Bridging Setup Plan 04:21 FXS Card Install 06:50 Racking up the Cisco 2821 Router 13:45 Powering up the Retro Rack 16:23 Checking the 2821 on the Retro Rack Network 17:14 Retro Rack Cable Improvements 20:16 IP Phone Testing 21:51 Merlin Phone Testing 24:06 Bridging Merlin and IP Phones 29:00 Installing Some Phones 29:24 Next Steps

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