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UC500 site to site vpn with ISDN backup

I've setup 2 UC500 with site to site vpn over the internet. Can I configure an ISDN backup for the crypto tunnel ? If yes, can I find a sample config ?

Thx

Filip

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Re: UC500 site to site vpn with ISDN backup

The Multi-site feature links a maximum of five small offices with IPSEC VPN connections to a Cisco UC500, one at each site, which is connected in full-mesh topology. PBX functionality is configured on each Cisco UC500 with a coordinated dial plan.

http://www.cisco.com/en/US/docs/voice_ip_comm/sbcs/release/notes/SBCS_RN1.html#wp69515

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