I recently set up a firewall and had AT&T drop off a fiber connection to implement an internet failover solution. My primary ISP is Spectrum over coax, but I had originally planned for a backup with a Peplink cellular router using a Verizon SIM in case AT&T's fiber was going to take forever. Luckily, AT&T managed to get the fiber done quickly, and I didn't even get to use the Peplink. Now, I'm considering ditching Spectrum altogether and using the Peplink as my WAN2. However, I'm concerned about the CGNAT issues my soft phones might face on the cellular backup. How bad will the CGNAT impact my VoIP services? Should I just stick with Spectrum?
3 Answers
From what you've said, it sounds like you might not have all the tech knowledge about managing multiple internet connections. One option is to outsource that knowledge, which is common now, but eventually, you'll lock yourself into a vendor and may face high costs with poor support later on. The other option is to learn it yourself; it’s hard, but you'll gain valuable knowledge for the future.
Honestly, it depends on your phone system setup. What type of system are you using? If it’s hosted in the cloud, it might perform okay with cellular, but I've noticed some variations depending on how the provider's infrastructure is organized. Testing it out with a few phones is the best way to find out.
I wouldn't recommend relying on cellular for your softphones just yet. You could set up the Peplink as WAN2 and route traffic for a couple of phones through it. This way, you can test the performance without fully committing to it. If the cellular connection isn’t stable, then it’s probably best to keep Spectrum as your main ISP.

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