Can CME 4.0 work with Nortel Meridian Digital PBX? We would like to install CME 4.0 and connect it to this Nortel PBX. The phones that are connected to Nortel PBX are digital phones.We are replacing all the office phones with Cisco IP Phones. The warehouse phones will remain analog with cat3 cabling and overhead paging that uses cat5e. How can we make this work?