Allowed port no (tcp / udp)

General Help
1

What port no (tcp / udp) should be opened in iptables for FreePBX working properly?

please advise

thanks & regards

2

Asked and answered numerous times here.
UDP 5060 for SIP, UDP 10000 - 20000 for RTP

3

don’t forget 4569 for IAX if you use it…