Call not routing to voicemail when called from internal number

[LakesideLion]

Strange behavior and I'm not even sure where to look.   If I call an extension with the DID number from an external phone, if no one picks up it correctly routes the call to voicemail.   If however I call that extension from another extension, if no one picks up, it routes to another extension.   I need it all none pick ups to go to voicemail.   I can't find where the internal call goes to another extension.  We do have a "call rerouting first alternative" that redirects to dial "4" which is our voicemail number but I can't find any setting showing it should redirect to our front office extension.

Can anyone try to help me find it?

[lundah]

Are all of your options in line 4 of that re-route the same? All of them should be set for "This" for the action you want to happen.

[ZuluAlpha]

Do a "Locate Feature Extension xxxx" on the extension in question. They probably have it set to forward on no answer external.