DCS-VIP Internet Keyphone Quick Guide— 35 —Now the system is configured to allow you to dial any extension on the six systems in our net-work. The dialling format is:80 XXX YYYwhere XXX is the system code (e.g. 100 for the Oxford Gateway system), and YYY is the desti-nation extension number.The DDI table allows incoming calls to access all extensions, all station groups and trunk group9.Allow Break In and Break OutThis is done using MMC programming from a keyphone. (Refer to the Samsung DCS-VIP Inter-net Keyphone Programming Manual for details.)MMC 821 (Set VoIP Option)Options: VoIP ‡ BRI TANDEM (YES/NO)BRI ‡ VoIP TANDEM (YES/NO)If both of these options are set to YES (“ON”), this will allow calls to break in and out of the VIProuter to the VoIP connection.MMC 210 (Customer On/Off Per Tenant)Option: TEN. ON AND OFF ‡ VIP TAND PWD OFF/ONIf set ON, this enables password protection for break in.The final procedure is to direct incoming calls to one of the VoIP trunks. Depending on whattype of trunks you are using (MSN or DDI) you will need to set up the appropriate table (DIDDigit or MSN Digit) as shown below.