minimal firewall configuration

Greetings all

I was going through my newly upgraded VitalPBX settings (4.5) and noticed that there are probably many services within the firewall rules which do not need to be here.

Can someone confirm that we do NOT need the following services to have an open port:
DHCP / I dont answer DHCP requests in my case
NTP / Not sure who would do NTP Queries on my VitalPBX
IAX2 / I m not connected to any other Asterisk PBX
mDNS / Not using this service as my PBX is on a public network
SIP / ← Do I need this as I am using PJSIP ?
VPBX API / ← Do I need this if I am using any of the Vital Suite or Vitxi?
Asterisk HTTP Daemon / ← Is this for AMI calls and needed?

Thank you all

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