0x2759 Call State
(Interworking Only)

Used in:
0x0033 NPDI Universal ICB

Byte | Description
0, 1 | Tag 0x2759
2, 3 | Length Variable
4 | Value[0] Coding Standard 0x00 CCITT Standardized Coding 0x01 ISO/IEC Standard 0x02 National Standard 0x03 Standard specific to identified location
| User Side 0x0000 Null 0x0001 Call Initiated 0x0002 Overlap sending 0x0003 Outgoing call proceeding 0x0004 Call delivered 0x0005 Call present 0x0006 Call Received 0x0007 Connect Request 0x0008 Incoming call proceeding 0x0009 Active 0x000a Disconnect request 0x000b Disconnect Indication 0x000c Suspend request 0x000d Resume request 0x000e Overlap receive 0x000f Restart Request 0x0010 Restart 0x0011 Call abort Network Side 0x0100 Null 0x0101 Call Initiated 0x0102 Overlap sending 0x0103 Outgoing call proceeding 0x0104 Call delivered 0x0105 Call present 0x0106 Call Received 0x0107 Connect Request 0x0108 Incoming call proceeding 0x0109 Active 0x010a Disconnect request 0x010b Disconnect Indication 0x010c Suspend request 0x010d Resume request 0x010e Overlap receive 0x010f Restart Request 0x0110 Restart 0x0111 Call abort All other values are reserved.

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.
Comité Consultatif Internationale de Telephonique et Telegraphique (now ITU)
International Standards Organization