Byte

Description

0, 1

Tag 0x2763

2, 3

Length Variable

4

Value[0] Type of network and network ID plan

Bit 7 Spare bit, should always be 0

Bits 6-4 are for type of network ID:

010 national network identification

000 CCITT-standardized identification

111 not sure about whether it is national or CCITT

Note that CarrierID parameter is just for ANSI national
network (ANSI T1.113-1995, 3.8A), so it should only be set
as "010". But the current implementation of IW will
translate TNS into universal Carrier ID as well, which may
be used in CCITT, so we have to keep "000" and "111" in
our usage.

Bits 3-0 Network ID plan

0001 3-digit carrier ID

0010 4-digit carrier ID

0000 Carrier ID parameter does not present in
the incoming call, that the carrier ID unknown,
and this whole parameter is just a void Carrier ID.

5

Value[1] Circuit number

6

Value[2] Number of Digits

7

Value[3] BCD digits pair

8

Value[4] BCD digits pair