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Category: Network & Firewalls

Configure Cisco RV325 for VoIP

TL;DR

To configure a Cisco RV325 for VoIP, update the firmware to version 1.1.1.06 or later and navigate to the Firewall settings. Disable SPI, DoS, Block WAN Request, and SIP ALG, and enable Firewall and Remote Management. Additionally, set the UDP Timeout to 300 seconds to prevent issues with cloud-based VoIP. Saving these changes will help ensure proper VoIP functionality.

The default firewall settings on Cisco routers have SIP ALG and SPI (Stateful Packet Inspection) enabled, which can cause issues with cloud based VoIP. 

Firewall Configuration

  1. Go to System Summary and ensure that the firmware is up to date (1.1.1.06 or later).

  2. If needed, update firmware by going to System Management > Firmware Upgrade.

  3. Go to Firewall > General.

  4. Ensure that Firewall and Remote Management are enabled (checked).

  5. Ensure that the following are disabled (unchecked):

    • SPI (Stateful Packet Inspection)

    • DoS (Denial of Service)

    • Block WAN Request

    • SIP ALG

  6. Click Save.

  7. Browse to IPADDRESS/f_general_hidden.htm.

  8. Set UDP Timeout to 300 seconds.

  9. Save all changes.