Bridge and Ethernet

I have come to a point now that i know that my sip provider will not work with mikrotik but i have a work-around

The only way i can get it to work is bridging with a dsl line and auth the voip phone with a dsl account.

My provider supplies the phone that double’s up as a router.

The idea is to create eoip tunnel on the clients side and bridge that with the ether.
A routerboard @ dsl line , eoip to client and then bridge with dsl line. That all works.

My problem now is that when i have more than one eoip bridge on the dsl line clients start getting the wrong IP address etc etc . All the clients are in a bridge now.

Is there any way to be able bridge ether and eoip and still keep the ether separate on the client side ? Be able to run a dhcp-server on the ether and not the bridge ?