As per kwbMitel, if you dont need to cluster and just want to call between the two then you do not need to upgrade just IP trunking with simple ARS will suffice.
MCD 6 uses the GDM database model. Release 9 doesn't so I do not believe you could create a cluster out of the two different loads. As kwbMitel recommends you can use ARS to connect the systems for your 4 digit dialling and you should be able to setup IP trunks between the two.
For the full benefits of the software upgrade the older system.
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