0x09 SS7 Link

To address an SS7 signaling link, use the SS7 Link Address Element:

Byte | AIB Field Description
--- | ---
2 | Address Element: 0x09
3 | Data Length: 0x02
4 | Data[0] Stack ID
5 | Data[1] Link ID

See Signaling System Number Seven.
The information in an AIB that follows the header, down to the data field. An AIB can have one or more Address Elements. AEs correspond to Span, Channel, and SS7 Link.
See Address Information Block.