Cisco SPA1112 Provisioning Manual page 186

Router Configuration Parameters
<VPN_Passthrough>
Parameter
<L2TP_Passthrough>
Provisioning Guide for Cisco SPA100 and SPA200 Series Analog Telephone Adapters
Details
Description: Enables or disables VPN passthrough for Layer 2
Tunneling Protocol (L2TP)
User Interface: Network Setup > Advanced Settings > VPN
Passthrough page, L2TP Passthrough field
Values:
0: Disabled
1: Enabled
Default: 1
Example:
<L2TP_Passthrough>1</L2TP_Passthrough>
<VPN_Passthrough> Example: All passthrough options
enabled
<router-configuration>
...
<VPN_Passthrough>
<IPSec_Passthrough>1</IPSec_Passthrough>
<PPTP_Passthrough>1</PPTP_Passthrough>
<L2TP_Passthrough>1</L2TP_Passthrough>
</VPN_Passthrough>
...
</router-configuration>
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