The only way to have a phone and a sip trunk device ring at the same time is using mobility (remote destination).
The gateway cannot determine if a call is a fax or voice call prior to answering the call. Unless there is an Ivr script you can run on the gateway that answers all calls, determines what call type it is and then forward the call to either fax or phone (on different numbers).
So I would think this cannot be done. You need to assign different numbers to your phone and faxes.
No you cannot have the same number reachable from the same gateway in two partitions.
On your dialpeer pointing to e cucm add a "fax protocol t38 version 0 ls-redun 0 hs-redun 0 fallback passthrough G711ulaw" and a, fax rate 14400, fax ECM disable and fax sg3-tog3 (something like this, commands from top of mind)
This also requires your fax server to support t.38 and / or g711ulaw.
Also make sure the outbound calls match on the inbound dialpeer so outbound calls are also permitted to use t.38
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.