Carrier Wifi Calling not working with FortiGate and Asus

[m_hamja]

Hi Experts,

I'm using FortiGate 80E with firmware version 7.4.1 for my network. I have an Asus RT-AC88U as access point for my wireless access. 

My carrier Wifi Calling not getting enabled on our mobiles. Is there any specific port or services that i need to enable on Lan to Wan policy? Kindly guide me. Thank you.

[abarushka]

Hello,

You may consider to run debug flow and try to reproduce the issue:

diagnose debug flow filter addr <phone IP address>
diagnose debug flow show function-name enable
diagnose debug flow trace start 100
diagnose debug enable

and check failed session setups.

[Kevex]

When Wi-Fi calling is enabled on a smartphone, an IPSec tunnel is established between the phone and the mobile network through which calls are routed.

Here's what AT&T says, but it's similar for other carriers.

Allow Internet Protocol Security (IPSec) and imap

Ports 500, 4500, and 143 (shown in the table) are used to communicate to the AT&T network and must be open.

Data ports

Port	TCP or UDP	Service or protocol name	RFC	Service name
500	UDP	Wi-Fi Calling	5996	IKEv2
4500	UDP	Wi-Fi Calling	5996	IKEv2
143	TCP	Internet Message Access Protocol (IMAP)	3501	imap

Google Wi-Fi WiFi Calling with your carrier name, like Verizon, to get their specific settings.