How to turn on the multiplexer?

Question

System administration

All the best ... Before the story: ATS (Asterisk) is spinning on a virtual box (ubuntu64x), it's not a good time and the HDD on which all this stuff is spinning began to crumble.
I found a new server, and it seemed that it was difficult to transfer the virtual machine. But Sanya still found his rake ..... put a virtual machine, rolled up vhd, ubuntu started, but the automatic telephone exchange is silent.
found in what a rake. to work, you need to push 2 network cards into the bridge (it was clear right away), and on one (physical) one you need to check the box "Network adapter multiplexer protocol". But this, this, this ...
in short, does not want to be exhibited. Writes "As a result, the following components will be disabled Network adapter multiplexer protocol" and the options "yes" - disable, "no" - do not enable.
prompt how to start automatic telephone exchange.

Answer 1

What is the host operating system? What network cards are there (write the motherboard model right away)?
The strange requirement - to put setevukha in the bridge. Why are there two of them?