This object contains the code transmitted on the signaling path when the channel is configured to transmit idle fault signaling. It's also used for driving/scanning the E&M signaling leads. This object is valid for em channels only. For fxo and fxs, the value is assigned internally by the system. The object is a bitmap arranged as follows: bit pos: | 7 6 5 4 3 2 1 0 | | x x x x A B C D | 'x' - don't care The default value depends on aluExtTmnxMDAVoiceCompandingLaw: For muLaw - 0 (or 0x0 or 0b0000) For aLaw - 13 (or 0xD or 0b1101) This object is invalid for em channels whose aluVoiceSignalingMode is 'transmissionOnly'.