problem with texecom oddysey tamper ?

hi guys,Im having a bit of trouble with the above, basically i have connected 2 bellboxes( texecom oddysey 3) to my alarm system. having followed the manual which came with the oddysey's i have removed the tamper wire from ms2 on the first unit and connected this to the spare core (white) using terminal block, then on the second unit i have connected this white core to the ms1.

the problem is the first unit is staying in hold off (left led flashing) regardless, the second unit works as normal. its just the first unit that is giving me trouble.

any help would be deeply appreciated thanks in advance.