SimpleVoIP: Firewall Setup
We are always adding servers, proxies, new ISPs, etc.
Individually entering server IP's to be whitelisted by your firewall manager can be problematic.
Most customers don’t block outbound traffic and therefore our phones are able to reach their necessary servers for calling as well as updates with no difficulty. However, DNS is probably the easiest to manage. We have load balancers and multiple A records, as well as DNS-SRV and NAPTR for the phones.
We highly recommend opening *.simplevoip.us and *.s.simplevoip.us
Brand new, or factory reset phones, will reach out to a redirect server hosted by the manufacturer. We recommend opening the following addresses based on your device when setting up or factory resetting your device:
Proxy and Config Servers used by SimpleVoIP
/24 Block IP Addresses used by SimpleVoIP
TCP/UDP Ports used by SimpleVoIP
UDP 8500 – 59999 Used for RTP and Phone Signaling
Regular operation of phones:
- On the very first boot or after a factory reset, phones look for a redirect server at *.yealink.com or *.panasonic.com or *.polycom.com
- Next, they are redirected to our configuration server to download configs and firmware at https://config.simplevoip.us
- Next, they attempt to register with our SBCs at https://*.simplevoip.us