Cisco Small Business Pro series Administration Manual page 84

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Field
PPTP Passthrough
L2TP Passthrough
Description
Point-to-Point Tunneling Protocol (PPTP) allows the
Point-to-Point Protocol (PPP) to be tunneled through an
IP network. PPTP Pass-Through is enabled by default.
To disable PPTP Passthrough, select Disabled.
Layer 2 Tunneling Protocol is the method used to enable
Point-to-Point sessions via the Internet on the Layer 2
level. L2TP Pass-Through is enabled by default. To
disable L2TP Passthrough, select Disabled.
Configuring VPN
SRP 521 VoIP Gateway Administration Guide
VPN Passthrough