3.3.10

3.3.10 SETUP ACKNOWLEDGE

This message is sent by the network to the calling user, or by the called user to the network, to indicate that call establishment has been initiated but additional information may be required. See Table 3-44.

Table 3-44/Q.931

SETUP ACKNOWLEDGE message content

Message type: SETUP ACKNOWLEDGE 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-*
Display	4.5	n ® u	O (Note 2)	(Note 3)
NOTES 1. Mandatory in all cases, except when the user accepts the D-channel indicated in the SETUP message. 2. Included if the network provides information that can be presented to the user. 3. The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets.