A DSS1 SETUP üzenet

This message is sent by the calling user to the network and by the network to the called user to initiate call establishment.

Information element	Direction	Type	Length	Note
Protocol discriminator	Both	M	1
Call reference	Both	M	2-*
Message type	Both	M	1
Sending complete	Both	O	1	Included if the user or the network optionally indicates that all information necessary for call establishment is included in the SETUP message.
Repeat indicator	Both	O	1	The Repeat indicator IE is included immediately before the first Bearer capability IE when the bearer capability negotiation procedure is used .
Bearer capability	Both	M (Note 3)	4-12	May be repeated if the bearer capability negotiation procedure is used (see Annex L). For bearer capability negotiation, two Bearer capability IE may be included in descending order of priority, i.e., highest priority first. Although support multiple Bearer capability IE may not be supported on all networks, on networks that do support it, and through suitable subscription arrangements, two Bearer capability IE may be included (see 5.11). When they are not preceded by a Repeat indicator IE, they are included in ascending order of priority.
Channel identification	Both	O (Note 4)	2-*
Progress indicator	Both	O (Note 5)	2-4
Facility		O		Q-SIG
Network specific facilities	Both	O (Note 6)	2-*
Display	n -> u	O (Note 7)(Note 8)
Keypad facility	u -> n	O (Note 9)	2-34
Signal	n -> u	O (Note 10)	2-3
Calling party number	Both	O (Note 11)	2-*
Calling party subaddress	Both	O (Note 12)	2-23
Called party number	Both	O (Note 13)	2-*
Called party subaddress	Both	O (Note 14)	2-23
Transit network selection	u -> n	O (Note 15)	2-*
Repeat indicator	Both	O (Note 16)	1
Low layer compatibility	Both	O (Note 17)	2-18
High layer compatibility	Both	O (Note 18)

NOTES:

• 4 Mandatory in the network-to-user direction. Included in the user-to-network direction when a user wants to indicate a channel. If not included, its absence is interpreted as "any channel acceptable".
• 5 Included in the event of interworking or in connection with the provision of in-band information/patterns.
• 6 Included by the calling user or the network to indicate network specific facilities information (see Annex E).
• 7 Included if the network provides information that can be presented to the user.
• 8 The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets.
• 9 Either the Called party number or the Keypad facility IE is included by the user to convey called party number information to the network. The Keypad facility IE may also be included by the user to convey other call est
• ablishment information to the network.
• 10 Included if the network optionally provides additional information describing tones.
• 11 May be included by the calling user or the network to identify the calling user. Not included in the network-to-user direction for basic call control, but may be included for some supplementary services.
• 12 Included in the user-to-network direction when the calling user wants to indicate the calling party subaddress. Not included in the network-to-user direction for basic call control, but may be included for some supplementary services.
• 13 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. The Called party number information element is included by the network when called party num information is to be conveyed to the user.
• 14 Included in the user-to-network direction when the calling user wants to indicate the called party subaddress. Included in the network-to-user direction if the calling user included a Called party subaddress IE in the SETUP message.
• 15 Included by the calling user to select a particular transit network (see Annex C).
• 16 Included when two or more Low layer compatibility IEs are included for low layer compatibility negotiation.
• 17 Included in the user-to-network direction when the calling user wants to pass low layer compatibility information to the called user. Included in the network-to-user direction if the calling user included a Low layer compatibility information eleme n the SETUP message. Two, three or four information elements may be included in descending order of priority, i.e. highest priority first, if the low layer compatibility negotiation procedures are used (see Annex J).
• 18 Included in the user-to-network direction when the calling user wants to pass high layer compatibility information to the called user. Included in the network-to-user direction if the calling user included a High layer compatibility information ele in the SETUP message. Although support of multiple High layer compatibility information elements may not be supported on all networks, on networks that do support it, and through suitable subscription arrangements, two High layer compatibility informatio n elements may be included (see 5.12). When they are not preceded by a Repeat indicator information element, they are included in ascending order of priority.