Question: In a Public Land Mobile Network (PLMN), what primarily determines the channel mode (full or half rate, speech codec conversion) for a call setup, despite user or DTE overrides on other parameters?
Option 1: Network decision based on requested bearer/teleservice, available resources, and UE's channel mode capability
Option 2: User selection via UE settings, overriding network defaults
Option 3: DTE/DCE Interface configuration, independent of network or UE capabilities
Option 4: Predefined default conditions set by the UE for telephony calls
Explanation: The correct answer is Option 1 because, in a PLMN, the channel mode for a call setup is ultimately decided by the network, considering the requested bearer or teleservice, available resources, and the User Equipment's (UE) channel mode capabilities, despite user or DTE overrides on other parameters.