Wondering if anyone could provide some thoughts on this issue. I have 4 FXO lines connected to Verizon FIOS service. This installation has been working fine for over 2 months and all of sudden we are experiencing outbound calling issues. Every some number of calls, when they dial the number the UC520 picks a line and then the user is presented with a low tone and they hear dial-tone. I don't know if I missing something on my voice-port configuration or is this something that is a Verizon issue.
And you are talking about outbound calls right? It could be that you are matching an outbound dial-peer but not sending additional digits, therefore you get dialtone from the Telco, since you are basically just seizing the line. I would check the dialplan very carefully.
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