We changed SIP-Alg from kernel-based to proxy-based and changed the SIP
Firewall Rule from Flow-based to Proxy based, and now it is working.
maybe forti has a bug in kernel-based SIP-ALG Helper in Version 7.2.5
We have also this problem and the same answer from TAC: They are not
willing to take care of the bug neither forwarding it , because they do
not support the free version of forticlient.... It's so poor..
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