I understand EFM, VDSL, ADSL, Leased lines but im struggling to get my head around configuring MPLS EFM for a phone system.

MAIN SITE
LAN: 192.168.55.0/24
Router1: 192.168.55.254 (V2920 running Data EFM & VDSL)

SUB SITE
LAN: 192.168.2.0/24
Router2: 192.168.1.1 & 192.168.2.1 (V2830 running ADSL, VLAN splits phones & data)

The phone company have installed a MPLS EFM for the phone system at either end to talk. I have purchased a Vigor 2130n for the MAIN SITE which I will give LAN IP 192.168.55.240 and im going to use the current V2830 WAN2 socket at the subsite.

When I plug the EFM into both ends what IP settings do I put in? For normal EFM I would be given static IP details but as I understand it MPLS doesn't have this information and you self configure. Any advice would be grateful?