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 3-16.
SETUP ACKNOWLEDGE message content
Message type: SETUP ACKNOWLEDGE |
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Information element |
Reference (subclause) |
Direction |
Type |
Length |
Protocol discriminator |
Both |
M |
1 |
|
Call reference |
Both |
M |
2-* |
|
Message type |
Both |
M |
1 |
|
Channel identification |
Both |
O (Note 1) |
2-* |
|
Progress indicator |
Both |
O (Note 2) |
2-4 |
|
Display |
n ® u |
O (Note 3) |
(Note 4) |
|
Signal |
n ® u |
O (Note 5) |
2-3 |
|
NOTES 1. Mandatory in all cases, except when the user accepts the specific B-channel indicated in the SETUP message. 2. Included in the event of interworking or in connection with the provision of in-band information/patterns. 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 information describing tones (e.g. activate dial tone). |
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