Question: How does a mobile station, supporting group IDs with prefixes, behave when receiving a VGCS notification with a non-matching last digit of the Group Call Area ID to its stored prefixes?
Option 1: It pre-empts the current call (if eMLPP is applied) and joins the voice group call.
Option 2: It provides an indication similar to call waiting, if applicable, but does not join the call.
Option 3: It ignores the notification without any acknowledgement.
Option 4: It may send an acknowledgement but does not react by joining the voice group call or providing a call waiting indication.
Explanation: According to specifications, if the last digit of the Group Call Area ID in the VGCS notification doesn't match the default prefix or one of the stored prefixes for the group ID on a mobile station that supports prefixes, it won't join the call or provide a call waiting indication as it would with a matching prefix. However, it may still respond with an acknowledgement, highlighting a nuanced handling based on prefix matching.