I'm using a PK5001Z DSL modem/router on my home network (CenturyLink ISP) and have been trying to use the VOIP capabilities of Signal (secure encrypted messaging/calling app for android) but keep getting "network fail" errors when we try to call from our home LAN. I've gone to the Signal support/bug sites and no help there. The only thing I find is to ensure all UDP ports are open outbound and a few TCP ones as well. I've checked the modem firewall and it looks to me that it is set up correctly.
I can use Skype no problems. I suspect this is an issue on Signal's end but wanted to check in here to see if anyone else has made the PK5001Z work with Signal.
thanks,
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