This read-write TruthValue defines whether CAS (Channel Associated Signaling) bits need to be transported to the other endpoint via NSE packets. This lets an admin ensure CAS signaling state survives the VoIP transport rather than being lost or corrupted by the voice codec path, which matters for trunking applications relying on CAS between gateways. For example, an admin setting up a VoIP trunk between two CAS-signaled TDM networks would enable vismVoIpCasTransport so the ABCD signaling bits are faithfully relayed end-to-end.