Question: In the context of Profile Registration, what action does an IM-MGW take if it receives a proposed alternative profile from the MGCF that it supports?
Option 1: Immediately commence service with the proposed profile without further confirmation.
Option 2: Reject the proposed profile and terminate the registration process.
Option 3: Issue a new ServiceChange Request to explicitly confirm acceptance of the proposed profile.
Option 4: Continue with the original requested profile, ignoring the MGCF's proposal.
Explanation: If the IM-MGW supports the indicated (proposed) profile, it must send a new ServiceChange Request to explicitly confirm its acceptance of that profile to the MGCF, ensuring mutual agreement on the profile for smooth network operation and upgrades.