Multiple PBX - One SIP Provider

I have a sip account, 10 DID’s and one pilot.
I currently have an asterisk server. I want to create a new server to run side by side and only use 2 of my 10 DID’s without creating a new account for basically double the price.

My service provider uses an Edgewater EdgeMarc 4550 to provide the service.

Can this be done with vlans or something?

Why don’t you inter-connect the two Asterisk servers via a SIP/IAX? That way only one server will be connecting to the provider and realaying the calls to two DID’s you want to the second server.