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3.2.6 PROGRESS

This message is sent by the called user or the network to indicate the progress of an access connection establishment in the event of interworking within a private network. See Table 3-28.

Table 3-28/Q.931

PROGRESS message content

Message type: PROGRESS
Significance: local
Direction: user to network

Information element

Reference
(subclause)

Direction

Type

Length

Protocol discriminator

4.2

u ® n

M

1

Call reference

4.3

u ® n

M

2-*

Message type

4.4

u ® n

M

1

Cause

4.5

u ® n

O (Note)

2-32

Progress indicator

4.5

u ® n

M

4

Note - Included by the called user to provide additional information.