Fxo no dial tone

Sometime during the past couple of weeks I seem to have lost dial tone on my analog devices. Calls still complete but the missing dial tone is a bit irksome. Any ideas?

Who’s card are you using?

version of freepbx, asterisk, OS, etc…

It is kind of hard to determine without some specific details, just like me saying my car will not start today, can you help.

Sorry, thought it might be somehting obvious I was missing…

Asterisk (Ver. 1.4.10.1)
FreePBX 2.3.0.3
Zaptel 1.4.5.1
Digium TDM4xxP

;;;;;;[4500]
signalling=fxo_ks
record_out=Adhoc
record_in=Adhoc
[email protected]
immediate=no
echotraining=800
echocancelwhenbridged=yes
echocancel=yes
dial=ZAP/1
context=from-internal
callprogress=no
callerid=device <4500>
busydetect=yes
busycount=7
accountcode=
channel=>1