USG20W-VPN Firmware 4.60 Blocks iPhone WiFi Calling Port 4500

SierraTech
SierraTech Posts: 30  Freshman Member
First Anniversary 10 Comments Friend Collector
edited April 2021 in Security
Yesterday I upgraded from FW 4.38 to 4.60 on USG20W-VPN.  Ever since doing so, I can no longer make or receive WiFi calls on iPhone.

The logs show Source Address xxx.xxx.xxx.xxx:4500 and my destination Address xxx.xxx.xxx.xxx:1028 "ACCESS BLOCK".

I did not look at this UDP port in logs on earlier firmware, but according to documents the following Ports must be able to pass:


These ports need to be open for wi-fi calling: 143/tcp, 500/udp, and 4500/udp

How do I open these ports so I can make and receive WiFi calls on iPhone.  I have no coverage for Verizon, and I don't want to roll back to 4.38 (still in alternate FW space).

Any suggestions?  I don't want to assign a Fixed IP address on my iPhone either.

All Replies

  • SierraTech
    SierraTech Posts: 30  Freshman Member
    First Anniversary 10 Comments Friend Collector
    {destination Address xxx.xxx.xxx.xxx:1028 "ACCESS BLOCK"}

    The destination Address was the WAN Public IP. Forgot to mention this......

  • Jeremylin
    Jeremylin Posts: 166  Master Member
    First Anniversary First Answer First Comment
    Did you face this issue with default configuration?
    Disable firewall, the issue disappear? you may try to test with other phone see if face the same issue.

Security Highlight