The agent phone timeout can be adjusted to whatever works for your team. The default is 30 seconds. Go to ACD, then ACD Settings, then Station Profiles. This is where profiles are created and managed. Create a new profile for the timeout that works ...
The NICE CXOne Auto-Attendant will come through the Ternio mobile app just like any regular incoming call. The Auto-Attendant directs calls to individual agents vs. a whole group assigned to a skill.
PSTN can be turned on and off on CXOne by a Security Option that is set per Role. Also, PSTN can be turned off by CXOne because it is not part of the specific connectivity plan. In this case you will need to contact CXOne directly to turn on.