{UPDATE] M900 Multicell Deployment - Scenario Advice

Hello

Looking for advice on the following use-case scenario. 

• Separate offices but within walking distance
• Need Snom DECT M65 handsets to work in both locations.
• Continuous RF coverage between both is not required. 
• RF link between two M900 base stations is not possible - seems too far / too many obstacles. 

My question is do we have 2 x M900 operating as separate primary stations? 

In that case, do we need handsets registered on both base stations and is that even possible? 

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So I have found the following in the M900 PDF and believe we need multi-primaries enabled for our two locations. 

However the manual is not that helpful in completing the setup in this way. 

I'm unsure now what is meant by "To add the second primary, it must be configured manually as a primary. " Does this mean we need to manually configure the SIP servers for the 2nd primary? 

After testing this, the second primary is running in the DECT config tree, but it flashes red as it cannot seemingly achieve a SIP registration. 

Note:  To run a system with two separate primaries in two locations, Allow multi primary and Auto configure DECT sync source tree must be enabled.  To add the second primary, it must be configured manually as a primary.   Alternatively, the “Auto create multi primary” must be enabled. After installing the multicell installation, you can switch to manual configuration of the synchronization source tree by disabling the Auto configure DECT sync source tree setting.