The purpose of the Reverse charging information element is to indicate that reverse charging has been requested for that call. It may be used for X.25 packet-mode calls when either an X.25 Reverse charging facility is received in an X.25 Incoming Call packet and X.25 and Q.931 mapping applies.
The Reverse charging information element is coded as shown in Figure 4-44 and Table 4-33.
The maximum length of this information element is 3 octets.
Bits |
||||||||
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
Octets |
Reverse charging indication Information element identifier |
||||||||
0 |
1 |
0 |
0 |
1 |
0 |
1 |
0 |
1 |
Length of information element contents |
2 |
|||||||
1 ext. |
0 |
0 |
0 |
0 |
Reverse charging indication |
3 |
||
Spare |
||||||||
Reverse charging indication information element
Reverse charging indication information element
Reverse charging indication (octet 3) |
|
Bits |
|
3 2 1 |
|
0 0 1 |
Reverse charging requested |
All other values are reserved |
|