Hi DKwest
There has been some difficulties with the CSLIB12E (12 analog station numbers). No dialtone was available, or a high annoying sound was also heard.
If an ipLDK-100 or 300 was installed with more than one cabinet, then, after a power loss or restart, there could be no dial tone or a high annoying tone.
If you are running ipLDK-100/300 in s/w 3.7 or 3.8, which is the minimum s/w for the KSU, then you should upgrade your CSLIB12E to firmware version: 1.0Ca (gs30i10ca).
Also check your grounding. It is very important to have a good grounding, also use the ferrite cores for all power cables and lines (both station lines and CO lines).
Let me know, if you need more information...
///doktor