I have an IP LDK 20 system and have recently fitted a VMIBE board. I would like to use it as an answerphone that calls can be forwarded to. However, I am having trouble allowing stations access to the VMIBE, I go to PGM 113 and it asks for "station range." Is this the number of stations? The programming manual refers to station range as 10-35? And whatever I press I cannot move it on the the enable stage.