Question: In GSM networks, according to 3GPP specifications, what does the Channel Indicator parameter signify for Cell Broadcast Service (CBS), and which of the following channel types is OPTIONAL for both the network and Mobile Stations (MSs) to support?
Option 1: The Channel Indicator signifies the dedicated voice channel; optional support is for a data-only channel.
Option 2: The Channel Indicator signifies the CB channel; optional support is for an extended channel by the network or MSs.
Option 3: The Channel Indicator signifies the control channel; optional support is for a video broadcast channel by the network or MSs.
Option 4: The Channel Indicator signifies the SMS channel; optional support is for a multimedia message channel by the network or MSs.
Explanation: This question requires understanding of Cell Broadcast Service (CBS) specifications within GSM networks as per 3GPP. The correct answer, Option 2, accurately reflects that the Channel Indicator parameter identifies the CB (Cell Broadcast) channel for broadcasting data and that support for an extended channel by both the network and Mobile Stations (MSs) is optional, highlighting the importance of understanding channel utilization nuances in telecom networks for efficient service delivery.