Message type

Figure 1. Contents of the message type diagnostic code

Table 1 describes the contents of the message type diagnostic code.

Table 1. Message type
Byte	Description
7	Call Establishment Messages: X'02' CALL PROCEEDING X'07' CONNECT X'0F' CONNECT ACKNOWLEDGE X'05' SETUP Call Clearing Messages: X'4D' RELEASE X'5A' RELEASE COMPLETE X'46' RESTART X'4E' RESTART ACKNOWLEDGE Point-to-Multipoint Messages: X'80' ADD PARTY X'81' ADD PARTY ACKNOWLEDGE X'82' ADD PARTY REJECT X'83' DROP PARTY X'84' DROP PARTY ACKNOWLEDGE Miscellaneous Messages: X'7D' STATUS X'75' STATUS ENQUIRY
8	Bit 1 — Extension B'1... ....' Extension Bits 2 and 3 — Spare B'.0.. ....' Spare B'..0. ....' Spare Bit 4 — Flag B'...0 ....' Message instruction field is not significant. Regular error handling procedures apply. Ignore action indicator field. B'...1 ....' Follow explicit instructions in the action indicator field that supersedes regular error handling procedures. Bit 5 — Spare B'.... .0..' Spare Bit 6 — Spare B'.... .0..' Spare Bits 7 and 8 — Action Indicator B'.... ..00' Clear call B'.... ..01' Discard and ignore B'.... ..10' Discard and report status B'.... ..11' Reserved