Broadband ISDN User Part (BISUP) is a protocol intended to support services such as high-definition television (HDTV), multilingual TV, voice and image storage and retrieval, video conferencing, high-speed LANs and multimedia. Since BISDN is not widely deployed so far, so is not the BISUP.
The structure of the B-ISUP protocol is as follows:
| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | Octets |
| Message Type | 1 | |||||||
| Length Indicator | 2 | |||||||
| 3 | ||||||||
| Ext. | Broadband/narrow- band interworking ind | Pass on not possible ind | Discard message ind | Send notification ind | Release call ind | Transit at intermed exch. ind | 4 | |
- Message Type - The different message types. The following message types are available:
- Message Length - The message length in octets.
- Broadband/narrow-band Iinterworking Indicator for passing on, discard mesage, release call, etc.
- Pass on not Possible Indicator for release call and discard information
- Discard Message Indicator for dicard or do not discard message
- Send Notification Indicator for sending or do no sending notification
- Release call indicator for release or do not release call
- Transit at intermed exchance Indicator for transit interpretation or end node interpretation
Related Terms: SS7, ASP, BICC, DAP, ISUP, MTP, SCCP, TCAP, TUP, MAP
Sponsor Source: BISUP is defined by ITU-T Q.2762 and Q.2763.
Reference Links: http://www.itu.int/rec/recommendation.asp?type=folders&lang=e&parent=T-REC-Q.2762: General Functions of messages and signals of the B-ISUP of Signalling System No. 7