Sip registration to asterisk server with zoiper from WAN side?

which settings must i set up in order to register to asterisk(freepbx) from WAN side?
1-i must forward 5060 to my local freepbx host IP? right?
2-Stun must be enable in Zoiper softphone?

Please can you write which settings must be modified in freepbx?

  1. no. not needed, if you use different port for asterisk; server address: ip):portno
    2: leave it as default

“DTMF Settings” = “rfc-2833”

“Transports” = “UDP”