PLEASE NOTE: We highly recommend consulting an IT firm or network professional when configuring advanced network settings or devices.

QOS/Whitelist

For Quality of Service (QOS) rules on your router(s), please whitelist 35.225.57.188 for all TCP and UDP traffic.

VoIP Compatible Routers

NOTE: The routers listed here are known to work reliably with our services. However… given the constantly updated firmware and physical changes made by manufacturers and the nature of cloud-based services, The Kotter Group cannot control the final configuration of the hardware or your computer systems/networks, or promise that any given router will work with your system, or guarantee that our information is 100% up to date.

  • Ubiquiti
  • Sonicwall
  • Meraki
  • WatchGuard
  • Fortigate
  • Adtran
  • Cisco ASA
  • EdgeMarc

Routers with Known or Possible Issues

  • Modem/Gateway Combo’s from any cable provider
  • Netgear
  • Linksys
  • D-Link
  • TP-Link
  • ASUS
  • Google
  • Apple
  • Off-Brand
  • MediaLink
  • Cisco RV and lower series
  • PfSense
  • Untangle
  • ZyXEL
  • DD-WRT
  • Tomato

General Router Configuration

DO:

  • Enable Consistent NAT
  • Unblock TCP and UDP Outbound
  • Check for latency spikes and other issues
  • Check for packet loss
  • Ensure you have sufficient bandwidth
  • Set TCP/UDP timeouts to at least 300

DON’T

  • Enable SIP-ALG
  • DPI SIP Traffic
  • Use SIP Normalization
  • Use Static NAT’s for phones
  • Double NAT
  • Use SPI