PDF(44.7 KB) View with Adobe Reader on a variety of devices
ePub(88.8 KB) View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone
Mobi (Kindle)(130.3 KB) View on Kindle device or Kindle app on multiple devices
Updated:December 11, 2018
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
Configure the VPN Passthrough Setting for SPA122
The VPN Passthrough feature is usually used if there are devices behind the ATA (Analog Telephone Adapters) that need to set up IPsec tunnels independently. The page allows you to let the Internet Protocol Security (IPSec), Point-to-Point Tunneling Protocol (PPTP) and Layer 2 Tunneling Protocol (L2TP) pass through the firewall on the device.
The objective of this article is to configure the VPN Passthrough settings on SPA122 VoIP device.
Configure the VPN Passthrough
Step 1. Log in to the web configuration utility and choose Network Setup > Advanced Settings > VPN Passthrough. The VPN Passthrough page opens:
Step 2. Internet Protocol Security (IPSec) provides secure IP communications through authentication and encryption. To allow IPSec tunnels to pass through the ATA, IPSec Passthrough is enabled by default. To disable IPSec Passthrough, click the Disabled radio button.
Step 3. Point-to-Point Tunneling Protocol (PPTP) is the method used to enable VPN sessions through an IP network. To allow PPTP tunnels to pass through the ATA, PPTP Passthrough is enabled by default. To disable PPTP Passthrough, click the Disabled radio button.
Step 4. Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to support Virtual Private Networks (VPNs). It does not provide any encryption or confidentiality by itself; it relies on an encryption protocol that it passes within the tunnel to provide privacy. To allow L2TP tunnels to pass through the ATA , L2TP Passthrough is enabled by default. To disable L2TP Passthrough, click the Disabled radio button.
Step 5. Click Submit. The changes are saved and the device is updated.
Note: If the administrator disables passthrough, it will prevent VPN clients from connecting to your network.