Question: In a session-based messaging procedure between two registered User Equipments (UEs) in an IP Multimedia Subsystem (IMS), what is the primary purpose of including the maximum message size in the SDP offer of the initial INVITE request and its corresponding 200 OK response?
Option 1: To negotiate the codec for voice calls between UEs.
Option 2: To establish a limit for the size of messages that can be exchanged within the established session.
Option 3: To determine the type of multimedia content (e.g., video, image, text) that can be sent.
Option 4: To specify the protocol for acknowledging received messages.
Explanation: In session-based messaging within an IMS, indicating the maximum message size in the SDP offer and its response ensures both UEs are aware of size limits for exchanged messages. This prevents sending oversized messages, maintaining session integrity and functionality, unrelated to negotiating voice codecs, determining content types, or specifying acknowledgment protocols.