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3.3.6 INFORMATION

This message is sent by the user or the network to provide additional information. It may be used to provide information for call establishment (e.g. overlap sending and receiving) or miscellaneous call-related information. See Table 3-40.

Table 3-40/Q.931

INFORMATION message content

Message type: INFORMATION

Significance: local (Note 1)

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

Sending complete

4.5

Both

O (Note 2)

1

Cause

4.5

n ® u

O (Note 3)

2-32

Display

4.5

n ® u

O (Note 4)

(Note 5)

Keypad facility

4.5

u ® n

O (Note 6)

2-34

Called party number

4.5

Both

O (Note 7)

2-*

NOTES

1. This message has local significance, but may carry information of global significance.

2. Included when the user optionally indicates completion of overlap sending to the network, or if the network optionally indicates completion of overlap receiving to the user.

3. Included when the network optionally conveys additional information pertaining to user-user signalling (see clause 7).

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

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

6. Either the Called party number or the Keypad facility information element is included by the user to convey called party number information to the network during overlap sending.

7. The Called party number information element is included by the network to convey called party number information to the user during overlap receiving.