I have a 8x24 DR5 system with 4 phone lines. If you dial into a system with prompts, Line 1 works fine. If I use Lines 2-4 the dial tones never seem to get sent.
Those lines may be set to Pulse instead of Tone.
We had a Tech go out on a call with the same situation but with a 6X16 and said they had a bad KSU.
I went to site to install the new KSU and checked programming and it said Tone but could here it dialing Pulse, if I was going to install a new KSU I might as well do a system startup on the 6X16 and see if that would clear a bug with the software.....it did and all lines are now back to Tone.
Have somebody dial out and listen to the KSU to see if you hear it dialing in the Pulse mode to be sure.
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