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Can I use SR520-FE as VPN Server with Cisco871(remote) for UC520

Hi, I may have an issue here,

I am trying to use a Cisco 871 as VPN Remote to connect to SR520-FE as VPN Server to get access to my UC500. I can't use the UC500 VPN Server feature since it's WAN access is impossible (not accessible from the web because on a private network from service provider).

The connection between the SR520-FE and Cisco871 is also on a (simulated private network).

UC500 WAN IP: 172.10.10.2/29               (Gateway is 172.10.10.1)

UC500 VLAN100            10.1.1.0/29                    (CME IS AT 10.1.1.1)

UC500 VLAN1               192.168.10.0/24             (ip address is 192.168.10.1)

SR520 WAN IP:             172.20.13.2/29               (Gateway is 172.20.13.1)

SR520 VLAN1               192.168.10.0/24             (ip address is 192.168.10.11)

SR520 is connected as trunk to uc500

CISCO871 WAN IP :      172.20.14.2/29               (Gateway is 172.20.14.1)

CISCO871 VLAN1 :        10.10.10.0/24                (ip address is 10.10.10.1)

Both WAN of SR520 and 871 are connected together through service provider internal network.

(172.20.14.1 is direct to 172.20.13.1) < theses routers cannot be configured as they are supplied by the service provider.

CISCO871 connects to SR520 (VPN light comes up) and gets IP address 192.168.10.201 Voice services are enabled (phone gets option 150 to 10.1.1.1) but the phone never registers.

10.10.10.1 Can’t ping any remote host.

192.168.10.11 (SR520) Can’t ping it’s remote client 192.168.10.201.

Any idea why this is happening?

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