Forum Discussion
OnePlus 8-5G Wifi Calling has no sound
My family has been experiencing this as well, across OnePlus and Samsung devices. I just found this link on a Reddit thread and many users have reported it correcting this issue for them. It involves opening firewall ports up at your router. The article is filed under “WiFi calling on a corporate network” so how would we find it, right? Wi-Fi Calling on a corporate network | T-Mobile Support
Summary of the article:
Firewalls
IPv4 Address Block: 208.54.0.0/16:
PORT / PROTOCOL / DESCRIPTION
Port: 500 / UDP / IPsec - IKE : Authentication [WFC 2.0]
Port: 4500 / UDP / IPsec - NAT traversal : Encrypted voice traffic [WFC 2.0]
Port: 5061 / TCP + UDP / SIP/TLS : Encrypted SIP [WFC 1.0]
IPv4 Address Block: 66.94.0.0/19:
PORT / PROTOCOL / DESCRIPTION
Port: 443 / TCP / HTTPS : Used for handset authentication [WFC 1.0]
Port: 993 / TCP / IMAP/SSL : Visual Voicemail [WFC 1.0]
Also whitelist the CRL server for DIGITS OTT and WFC 1.0: crl.t-mobile.com 206.29.177.36
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