0x275E Steady Signal
(Interworking Only)

Used in:
0x0033 NPDI Universal ICB

Byte | Description
0, 1 | Tag 0x275E
2, 3 | Length Variable
5 | Value[0] Steady Signal Type 0x00 Normal polarity 0x01 Reversed polarity 0x02 Battery on C wire 0x03 No battery on C wire 0x04 Off hook (loop closed) 0x05 On hook (loop open) 0x06 Battery on A wire 0x07 A wire on earth 0x08 No battery on A wire 0x09 No battery on B wire 0x0a Reduced battery 0x0b No battery 0x0c Alternate reduced power/ no power 0x0d Normal battery 0x0e Stop ringing 0x0f Start pilot frequency 0x10 Stop pilot frequency 0x11 Low impedance on B wire 0x12 B wire connected to earth 0x13 B wire disconnected from earth 0x14 Battery on B wire 0x15 Low loop impedance 0x16 High loop impedance 0x17 Anomalous loop impedance 0x18 A wire disconnected from earth 0x19 C wire on earth 0x1a C wire disconnected from earth 0x50 Disable Autonomous response Before adding the new value, this value should be unique and should not be repeated in the Pulsed Signal's Signal Type field. All the other values are reserved.
| Value[1] Response Used to enable/disable autonomous acknowledge message. Use values as defined in Pulsed Type (in this TLV) and Steady Signal Type (in Steady-Signal TLV 0x275E). The following values are also valid: 0x50 Disable autonomous response 0xFF Response not used

Network Protocol Data Intelligence. Also called “Interworking,” it is a software product that operates within Excel’s Call Control (Layer 4) and Services (Layer 5) call processing layers. NPDI is meant to enhance Excel’s call processing product offering by allowing call processing layers (specifically Layers 4 and 5) to perform advanced analysis, generation, and conversion of Network Signaling (NS) Layer 3 information.
See Information Control Block.
Tag-Length-Value block. A standardized block that allows data to inserted in a standard way into API messages.