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The paper would detail the specific FACILITY messages used to manage multiparty calls:

Guidelines on handling simultaneous requests or invalid transaction identifiers. 5. Conclusion 124084

How a subscriber merges an active call and a held call into one conference session. The paper would detail the specific FACILITY messages

The protocol mandates specific timers to prevent network hanging; if a response to a hold request is not received before the timer expires, the mobile station must assume failure and inform the user. 124084

The "SplitMPTY" operation, which allows a user to separate one party from the group for a private conversation while keeping the others on hold. 4. Error Handling and Timers