Message type: ALERTING
Significance: global
Direction: both

Information element

Reference (subclause)

Direction

Type

Length

Protocol discriminator

4.2

Both

M

1

Call reference

4.3

Both

M

2-*

Message type

4.4

Both

M

1

Bearer capability

4.5

Both

O (Note 1)

4-12

Channel identification

4.5

Both (Note 2)

O (Note 3)

2-*

Progress indicator

4.5

Both

O (Note 4)

2-4

Display

4.5

n ® u

O (Note 5)

(Note 6)

Signal

4.5

n ® u

O (Note 7)

2-3

High layer compatibility

4.5

Both

O (Note 8)

2-5

NOTES

1. The Bearer capability information element is included when the procedures of 5.11 for bearer capability selection apply. When present, progress description No. 5, interworking has occurred and has resulted in a telecommunication service change shall also be present.

2. Included in the network to user direction for support of the procedures in Annex D.

3. Mandatory if this message is the first message in response to a SETUP, unless the user accepts the B-channel indicated in the SETUP message.

4. Included in the event of interworking. Included in the network-to-user direction in connection with the provision of in-band information/patterns. Included in the user-to-network direction in connection with the provision of in-band information/patterns if Annex K is implemented or in accordance with the procedures of 5.11.3 and 5.12.3.

5. Included if the network provides information that can be presented to the user.

6. The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets.

7. Included if the network optionally provides information describing tones or alerting signals.

8. The High layer compatibility information element is included when the procedures of for high layer compatibility selection apply. When present, progress description No. 5, interworking has occurred and has resulted in a telecommunication service change shall also be present.