The XTSc is not the same as the STS, the inskin voicemail stations would not be 150 thru 157. On the XTSc 156 and 157 are your 2 built in SLT ports. I have not used the inskin voicemail for the XTS yet. I guess its probably an inskin flash mail (the HDD one is not released yet). The best way to find out which station numbers are voicemail, would be to log into the XTSc (top COM port on the CKIB) and instead of typing the password, type "config", then "d s7". This SHOULD show the actual voicemail stations .These would go into VM group 440. You should also put these same numbers in hunt 450 (to point CO calls to). 440 uses integration for leaving/ retreiving messages, 450 would be general calls to menus. Hope this helps.