A DSS1 DISCONNECT üzenet

Information element	Direction	Type	Length	Note
Protocol discriminator	Both	M	1
Call reference	Both	M	2-*
Message type	Both	M	1

3.1.5	DISCONNECT
This message is sent by the user to request the network to clear an end-to-end connection or is sent by the network to indicate that the end-to-end connection is cleared. See Table 3-6.
TABLE  3-6/Q.931
DISCONNECT message content

Message type: DISCONNECT
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
Cause
4.5
Both
M
4-32
Progress indicator
4.5
(Note 1)
O (Note 2)
2-4
Display
4.5
n  ®  u
O (Note 3)
(Note 4)
Signal
4.5
n  ®  u
O (Note 5)
2-3
NOTES
1	Included in the network-to-user direction if the network provides in-band tones. See Annex D for usage in the user-to-network direction.
2	Included by the network if in-band tones are provided. However, the user may include the progress indicator and provide in-band tones. See Annex D. In such cases the network will ignore this information element and will not convey the in-band tones.
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.
5	Included if the network optionally provides additional information describing tones.