VOIP SIP custom port from WAN and LAN
I would like to use a custom port for SIP registration, mainly to reduce the risk of being targeted from the WAN side.
I defined a NAT rule and registration works ok from the wan.
Softphone is set to use the custom port and NAT forwards it to 5060 on the local IPBX.
Ideally, I would like the same softphone to register to the same custom port when connected to the LAN.
Is NAT reflexion the way to go ?
or is it better to change the server SIP port to the custom value ?
(I would have to reconfigure the hardphones which were set up manually. No big deal if necessary).