0x011B Reliable Provisional Response Mode

Voice over Internet Protocol. The delivery of voice information in digital form in discrete packets rather than in the traditional circuit-committed protocols of the public-switched telephone network (PSTN).

Byte	Description
0, 1	Tag 0x011B
2,3	Length 0x0001
4	Value[0-3] 0 - Disabled (default) 1 - Support 2 - Require