For clients that want to move from the Norstar digital system format to a VOIP format, Nortel BCM is the replacement product recommended by Nortel/Avaya. BCM uses all of the feature codes, and calling features of the older Norstar systems and integrates them into a Digital/VOIP format that with RLS3.0 and further, allows SIP trunking, Unified Messaging and the use of Nortel M7000 digital telephones, "T" Series Business Sets, i2004 sets, series 1200 VOIP sets, and the high end 1100E VOIP series sets, such as the Bluetooth compatible Nortel IP Phone 1140E SIP telephone series VOIP telephones. The advantage is that customers can use a mix of different generations of Nortel Telephones, ranging from early M7000 telephones to the latest full color display Nortel 1165E telephones. Unlike the past where M7000 Meridian telephones were dedicated for the smaller Norstar system and M2000/M3900 Meridian telephones were dedicated to the larger Option 11E/61C/81C PBX, the i2000/1200/1100E series IP telephones function on both the small-medium business (SMB) BCM platform as well as the larger Enterprise Communication Server 1000/Avaya Communication Server 2100 platforms, both taking on the features and codes on the display from their respective switch.