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UC540 in the Main Office. I need to select a cheap solution for the branch


We are trying to sell a Cisco SMB telephony solution to one of our customers. For the Main Office we selected the UC540 to handle the IP Telephony.

Our problem is that our customer has a branch office with one analog line and he wants to calls from the PSTN reaching this Line to the UC540 at the main office through a VPN over the Internet.

The costumer is not able to afford another UC500 just for this line at the branch.

We need to choose a cheap solution to get the calls from the PSTN at the branch office and redirect them to the main office. We thought about the SPA3102 and a router (the router for the VPN) but we are no sure whether this solution is going to  work.

Please let me know if you know a solution like this that could work, also the configuration guide if it is possible

Thanks a lot in advance

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