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I guess a good question at this point is whether or not the phones are picking internal dialtone when they go off hook or are they prime lined to a trunk or LCR.If they are prime lined to a trunk,you can dial 2? before you pickup the handset to get internal dialtone.
The IDS system has flexable first digits, if the previous tennate prefered they could had had any digit as the first digit of the intercom number. try dialing 1013 then 2013 3013,4013,5013 ect. since you get an error tone after the third digit i would bet the first digit is a 5.