|There is only one wan port with cable.|
I think perhaps powlaz you need to get clarification on the amounts and types of vpns needed.
"One of the machines in her office needs a VPN connection made to the manufacturer for monitoring and troubleshooting "
There are two types of vpns. One is site to site and one is vpn client to vpn server. In the case of the connection to the manufacturer that would be doubtful its a site to site since that is much more expensive to impliment and maintain. You should contact the manufacturer to clarify this. The manufacturer should provide you with the client vpn software to download and install.
In the case of a vpn for the phones... that does not make much sense unless you want to do extension dialing [like hitting 4 numbers to connect but than it would only be office to office communication not office to world communication. The vpn would isolate the phone traffic between.
The other office is on Comcast also for ip phones correct? If so you would need to discuss this with comcast.