Question: During an Inter-3G_MSC relocation without circuit connection for a Mobile Originated speech call, what does 3G_MSC-A include in the MAP-PREPARE-HANDOVER request to support codec selection by 3G_MSC-B?
Option 1: Iu Supported Codecs List and RAB configuration indicator based on internal configuration
Option 2: Only AoIP-Supported Codecs List (Anchor) for subsequent intra-3G_MSC-B intersystem handover
Option 3: NAS Synch Indicator alone for UTRAN Iu mode assignment
Option 4: No codec-related information is included in the request
Explanation: For speech calls, 3G_MSC-A includes the Iu Supported Codecs List in the MAP-PREPARE-HANDOVER request to enable 3G_MSC-B to select an appropriate codec. Additionally, if internally configured to do so, 3G_MSC-A may include the RAB configuration indicator to suggest a preferred codec, allowing for more tailored codec selection by 3G_MSC-B. This approach supports efficient and compatible codec selection between the two MSCs during the handover process.