I've had the same problem with our networked audix voicemails. If a subscriber on one of the networked voicemail systems has the same name, the problem recurs.
The solution is to vary the names a bit. Rehab1, Rehab2 works because the 1 and 2 are differing keypad keys; Rehab A and Rehab B won't work because A, B and C are on the same key.
Doug Frith
Accord Communications