It's very hard to answer my questions because my knowledge is very small. Now I have a 2 tasks and I even don't know where to start
1. I have a E1 from provider and 50 number, I have BP with CPU-D4, BTU-D, ELU-D (32), ELU-A 16. I can configure extensions, PBX groups I need but absolutley don't know what to do to configure the trunk.
2. And second question is for BTU-B card, I have Cisco VoIP gateway and I want to connect it to PSN via my BP250 with BTU-B. And again, I even don't know where to start.