site to site VPN

I have two offices connected using Dreyteks. Sites are connected by a LAN to LaN vpn.
I have introduced a VoIP hosted PBX and need to connect a vpn from each office to the PBX.  The PBX is on Windows 2012 but does not yet have a hardware firewall to connect a vpn .
I can establish  a vpn connection from the router to the Windows RAS by setting up another LAN to LAN connection but I do not get packets being routed.
I assume I need to make some additional configuration changes but I am not familiar enough to set this up on Windows.  I'd appreciate a little help.
Thanks
TMSAsked:
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masnrockCommented:
Could you please give a diagram? I am trying to figure out the requirement for another VPN. Most systems will let phones connect from remote networks. What type of PBX is it?
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Aaron TomoskySD-WAN SimplifiedCommented:
so you have a dreytek site to site, then you also have a dreytek (local) -> windows 2012 (remote) vpn connection? Is the dreytek your default gateway?
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TMSAuthor Commented:
Guys, thanks for your replies.  
Aaron, yes, that is the set up.
Unfortunately the PBX vendor does not support a VPN on the 3CX PBX server and my host does not provide a hardware VPN because VMWare ware only support their own VM version.  So, my only solution is to move to a hosting company that had a hardware solution already in place.  Didn't really think to ask initially as I just assumed it was a standard practice.
Thanks again.
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TMSAuthor Commented:
Solution was to install pfsense on a small Linux VMware server hosted on the VMware platform.  Has been working faultlessly.
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TMSAuthor Commented:
Found a robust free solution
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