Since the ZyWALL USG-20 has a very similar interface, the instructions below apply to the ZyWALL USG-20 as well.ĭetailed instructions are available from ZyXELL here ( see page 56, ZLD Configuration). If you are using Cisco phones, you need to disable SIP ALG. If you are using Poly phones with your ZyXELL ZyWALL, you need to enable SIP ALG. In the case of the ZyXELL ZyWALL USG-50, we want to 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. With certified by ICSA SPI Firewall and IPSec VPN, the ZyWALL USG 20s security features also include IPSec VPN, SSL VPN, Firewall, Content Filtering. While this device may be fully functional on the tested and/or current firmware version, it is possible newer revisions will cause disruptions in service or make a device fully compliant with the required settings for hosted VoIP services where it was previously not. Keep in mind different firmware versions will interact with hosted VoIP services in different ways. At the time of article creation, this device was in a known working state on the firmware used. The purpose of this article is to provide a sample configuration.
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