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How to use SIP to connect Cisco phones to my Cisco UM PBX from remote site

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How to use SIP to connect Cisco phones to my Cisco UM PBX from remote site

rsherrell
I have a remote site that only has Internet connectivity. The computers there can use the Cisco VPN and Cisco Soft Phone to connect but how could I use SIP from firewall to firewall to allow physical Cisco phones to connect automatically without the VPN?