Can't receive calls

I changed My router for a ZyXEL router. Right away I can’t receive calls (When some one try to call me sounds like I’m busy) and when I call them back (They can hear me, but I can’t hear them)

I did every single advice I’ve read so far, I’m only using G722/16000 and PCMU/8000 codecs. No video codecs. I disabled SIP ALG on my router, but still can’t fix the issue.

I’m an inexperienced user, and I’m need help cause I depend 100% on jitsi to work. what else can I try?

Jitsi 2.10.5550 shows online, but still doesn’t work.

Please help. Thanks.