is that the phone you have listed as a work contact? then it makes sense. or if your cell was the # and it was tried and not answered then I can understand going for the 2nd #.

guess it all depends on :
1. how bad they needed you
2. what #'s are on your contact list and in what order.

if you don't want them contacting you on the land line then have them remove it from your contact list. problem resolved. no drama.