We just sold a AP20 with 2 ML-440 handsets along with a NEC 24 button VoIP desk phone. They are using this setup at their remote site over a VPN connecting to a SV9100. The desk phone has no issues, the ML-440 are dropping calls to the point they are almost none usable. I got a feeling this ones going to be a hair puller.
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We get old too soon, smart too late