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.
All outbound POTS ports are configured like this:
voice-port 0/1/0
trunk-group ALL_FXO 64
supervisory disconnect dualtone mid-call
timeouts interdigit 3
timeouts call-disconnect 3
timeouts wait-release 5
connection plar 501
description xxx.xxx.xxxx
caller-id enable
Thanks in advance,
John