Question: When a P-CSCF receives both 'early session' and 'session' disposition SDPs with a single media line of the same type (e.g., 'audio') and directionality, how should it describe these SDP media lines in the service information?
Option 1: Always in separate session information media components with different flow IDs.
Option 2: In the same session information media component with the same flow ID, but only if the PCRF requests combined provisioning.
Option 3: In separate session information media components, each with a unique flow ID, to allow for potential future policy changes.
Option 4: In the same session information media component with the same flow ID, unless the P-CSCF desires to invoke special policies or separate event notifications.
Explanation: According to service information provisioning rules for early media, if a single media line with one media type is contained in both 'early session' and 'session' disposition SDPs of the same SIP dialogue with the same directionality, the P-CSCF should describe those SDP media lines in the same session information media component (with the same flow ID), unless it chooses to invoke special policies or separate event notifications for the 'early session' disposition media line. This approach optimizes resource allocation and reduces unnecessary reconfigurations during call establishment.