Signal's questions

I'm creating an SSH tunnel to a remote service through one of our servers. This server has 3 network interfaces, and the remote service has interface-specific restrictions in place based on IP and MAC address.

Local Machine --> Server --> Remote Service

Let's say the interfaces to the Server have an IP ending in .37, .38, and .39. The interface with .37 is facing the corporate network, thus accessible from my Local Machine, and the interfaces with .38 and .39 are facing the internal application network, thus able to access the Remote Service. The corporate and internal application networks are separate and cannot communicate with one another, hence the need for this tunnel.

ssh -L 5678:remote-service:1234 -N [email protected]

For some reason, I cannot find a way using ssh command line arguments to specify which interface to use on the Server, only on my Local Machine.

How do I force the SSH tunnel to bind to a specific interface on the Server?

I need to be able to specify which one to use and to use both concurrently, setting up two separate tunnels. Ideally only using ssh tunnels if possible, as this is a "pop-up" configuration that can be applied to multiple Servers on demand.

My boss wants me to find out who is costing us so much on our phone bills. On our phone bill, we can only see the numbers that are dialed, obviously we can't see what extension dialed them. We've spoken to our phone company but they're no use really.

How do I connect my PC to our PBX? And what do I use to download the data? We have a PBX system (Panasonic KX TA 308) -- I've read that I can connect via a COM port and download call data using software. I have offered to code this myself, but my boss is worried it won't be worth the time it would take, so he would rather go with specialized software ready to use that doesn't require too much work to set up.

Any help would be greatly appreciated. Thanks.