Originally Posted by monkeybrains

Reassignment Notifications – CBA Sec 25.A
It has come to the MEC’s attention that Crew Scheduling and the Chief Pilot’s Office are incorrectly utilizing a CBA section not yet in effect, to claim that pilots are improperly failing to respond to phone calls from the company. Pilots’ schedules are being labeled with the code UTC (unable to contact), and Base Chief Pilots are contacting these pilots for “fireside chats” as a first step in the disciplinary process.
Pilots are wondering if availability and schedule change notification requirements while flying a trip have changed.
The answer is NO; notifications of schedule modifications and pilots’ responsibilities have not changed. ALPA has informed management that the CPO should remove these UTCs from pilots’ schedules immediately and that they should refrain from placing UTCs on pilots’ schedules based upon this misapplication of Sec 25.A.
This conclusion is based on LOA 1, which is the agreement between the company and ALPA that defines the timelines and requirements for contract implementation. The LOA states that CBA Sec 25.A.4.b which when implemented will contain the availability and time requirements for pilots to respond to notifications from crew scheduling, will not be implemented until a means of electronic self-notification is available. Please note that LOA 19 changed paragraph numbering slightly so the relevant section 25.A.4.b was renumbered as 25.A.3.b.
Although ALPA has been informed that an electronic notification tool is in development and has been invited to participate in beta testing pre-deployment, this tool has not yet been launched or implemented by the Company. Furthermore, pilots are reminded that use of any electronic self-notification app will be at a pilot’s discretion when it becomes available.

CBA excerpts won’t copy.

We strongly encourage pilots to familiarize themselves with these CBA provisions should Crew Scheduling attempt to initiate a reassignment. As always, it is every pilot’s responsibility to know the contract and ensure that the company complies with it. If you have any questions or believe that you have been improperly reassigned, please send a DART.

seems pretty clear