0x2725 Forward Call Indicators
(Interworking Only)

Used in:
0x0033 NPDI Universal ICB

Byte | Description
0, 1 | Tag 0x2725
2, 3 | Length Variable
4-8 | Value[0] First byte indicator Bit 1 - Incoming International Call Indicator 0 Not an incoming international call 1 Incoming international call Bit 2 - End-to-End Method Indicator 00 No end-to-end method available 01 Pass along method available 10 SCCP Method available 11 Pass along and SCCP method available Bit 3 - Interworking Indicator 0 No interworking encountered (SS7 all the way) 1 Interworking encountered Bit 4 - IAM Segmentation Indicator 0 No indication 1 Additional information sent in an unsolicited information message Bit 5 - ISUP Indicator 0 ISUP not used all the way 1 ISUP used all the way Bit 6 - ISUP Preference Indicator 00 ISUP Preferred all the way 01 ISUP not required all the way 10 ISUP required all the way 11 Spare
5 | Value[1] Second byte indicator Bit 1 - ISDN Access Indicator 0 Originating access non-ISDN 1 Originating access ISDN Bits 2-3 - SCCP Method Indicator 00 No indication 01 Connectionless method available 10 Connection oriented method available 11 Connectionless and connection oriented method available Bit 4 - Spare Bits 5-8 - Reserved for National Use

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.
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 Signaling System Number Seven.
See Integrated Services Digital Network User Part.
See Integrated Services Digital Network.