Message type: ALERTING
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

Channel identification

4.5

u ® n

O (Note 1)

2-*

Progress indicator

4.5

u ® n

O (Note 2)

2-4

NOTES

1. Mandatory if this message is the first message in response to SETUP, unless the user accepts the channel indicated in the SETUP message.

2. Included in the event of interworking within a private network.