Note: We highly recommend consulting an IT or network professional when configuring advanced network settings and equipment.

The goal of configuring any router or firewall for use on 8x8 service is to prioritize VoIP traffic on your network and achieve optimum call quality. In the case of the ZyXELL ZyWALL USG-50, we want to

  • Enable FTP ALG
  • Enable H.323 ALG
  • Enable SIP ALG
  • Add port 5199 as a SIP Signaling Port

Since the ZyWALL USG-20 has a very similar interface, the instructions below apply to the ZyWALL USG-20 as well.

Detailed instructions are available from ZyXELL here (see page 56, ZLD Configuration).


To configure a ZyWALL USG-50

  1. On a computer, access the ZyWALL USG-50's web interface (GUI).
  2. Go to Configuration > Network > ALG.
  3. Enable SIP ALG.
  4. Go to Settings > Configuration > App Patrol > General.
  5. Enable Application Patrol, BWM, and enable Highest Bandwidth Priority for SIP Traffic.

    Note: You need to register IDP/App Patrol license to use App Patrol.

To add Port 5199 to the ZyWALL USG-50

  1. On a computer, access the ZyWALL USG-50's web interface (GUI).
  2. Go to Settings > Configuration > Network > ALG.
  3. Enable SIP ALG.
  4. In the SIP Signaling Port section, click +Add and enter 5199.


To change the UDP Session Time Out value

  1. On a computer, access the ZyWALL USG-50's web interface (GUI).
  2. Go to Settings > Configuration > Firewall > Session Control.
  3. Under General Settings: UDP Session Time Out, set the value to 300.