If you install a server to use the card in, it would be a separate server anyway, but you can “link” the new server with the original one through a trunk, whether SIP or IAX, whichever you choose. Since you have a s2s VPN between the two places, you can route the trunk through it and connect both places. To make it easier just make sure you choose different extension numbering, for example if the original place has extensions in the 1xxx range, use 2xxx for the new place.
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