I have a dir 601 and a grandstream gxp2000 I use roadrunner. My voip service was working but it quit. First it started where i could hear the people on the line but they couldn't hear me. I have called both the service provider for the voip and roadrunner and each blames the other
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. I'm not to sure what other information you need but whatever it is I'll find it Im just about ready to quit my job just so i dont have to mess with this crazy phone! Any and all help is greatly appreciated.