Message type: CALL PROCEEDING
Significance: local
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

Channel identification

4.5

Both

O (Note 1)

2-*

Progress indicator

4.5

u ® n

O (Note 2)

2-4

Display

4.5

n ® u

O (Note 3)

(Note 4)

NOTES

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

2. 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 in-band information/patterns if Annex K is implemented or in accordance with the procedures of 5.11.3 and 5.12.3.

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

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