Required VoIP freelancer for Mitel VoIP PBX configuration job

Hi,
we need to change a configuration for a VoIP Mitel 470.
Actually the Mitel 470 is located in the local network and in the same network as the VoIP phone.
Network configuration is:
Internet > router > firewall > LAN
We need to change Mitel IP address and move the PBX between router and firewall.
VoIP phone still need to register ti PBX.

Skills & Expertise Required

VoIP