We are installing a FreePBX together with a Sangoma SBC and the plan is to connect this to a BT SIP trunk provided via an existing 100Mb BT Leased Line (ie.synchronous ethernet connection, not ADSL).
We are prepping the SBC and FreePBX, but what we don’t know is how BT will physically present their SIP trunk to us.
Has anyone done this before? Do BT overlay the SIP trunk on the existing internet connection so it routes through our existing firewall? Or do they provide a separate physical Ethernet port from their router that we connect up directly to our SBC?
We’d like to get as much configured before BT arrive to do their stuff, but this makes a difference to the overall topology we will use.
If anyone has trodden this path before it would be good to know any gotchas too.