Multiply cluster roaming

[Exploizer]

Greetings.
We are planing to use DECT phones in several buildings. We need about 100 BS to cover all that space, what is more than one DM can handle. So we must setup a one cluster for each building. I looked through datasheet and found nothing about phone ability to work in different cluster.
To be clear - we don`t need handover between clusters, just ability to register on PBX while being in another DECT cluster, but in the same network.
Is it possible?