0x274F Progress Indicator
(Interworking Only)

Used in:
NPDI Universal ICB (0x0033)

Byte | Description
0, 1 | Tag 0x274F
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
5 | Value[1] Location 0x00 User 0x01 Private network serving the local user 0x02 Public network serving the local user 0x04 Public network serving the remote user 0x05 Private network serving the remote user 0x06 Network beyond the Interworking point
6 | Value[2] Progress Descriptor 0x00 (or 0x80*) Call is not end to end of same protocol 0x02 (or 0x82*) Destination address is non-ISDN 0x03 (or 0x83*) Origination address is non-ISDN 0x04 (or 0x84*) Call has returned to the ISDN 0x05 (or 0x85*) Interworking has occurred and resulted in telecomm service change 0x08 (or 0x88*) In-band information or an appropriate pattern is now available 0x40 (or 0xC0*) SCCP method available 0x60 (or 0xE0*) Pass along method available 0x20 (or 0x60*) Pass along and SCCP available 0xxxxxx Incoming half echo control device not included 1xxxxxx Incoming half echo control device included * when Echo device is included
7 | Value[3] Charge Indicator 0x00 No indication 0x01 No charge 0x02 Charge
8 | Value[4] Called Party’s Status Indicator 0x00 No indication 0x01 Subscriber free 0x02 Connect when free
9 | Value[5] Holding Indicator 0x00 Holding not requested 0x01 Holding requested
10 | Value[6] SCCP Method Indicator 0x00 No indication 0x01 Connectionless method available 0x02 Connection oriented method available 0x03 Both connectionless and connection oriented method available
: | Optional Bytes For future enhancements in protocol. Also can be used to customize the protocol with other information with this packet.

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
Interworking is a software feature within the Excel platform call control layer that enables protocol conversion by analyzing and converting Network Signaling (NS) Layer 3 information.
See Integrated Services Digital Network.