Information Elements (IEs) must appear in numerically ascending order within ascending codeset order. Not all IEs are valid with all message types. IEs take two formats; one-octet IEs or variable length IEs.
The documentation defines four codesets being:
These IEs are all shift types (escape codes in non-ITU language) between various code sets.
Value | Meaning |
0x95 | Locking Shift to Codeset 5 |
0x96 | Locking Shift to Codeset 6 |
0x9D | Non-Locking Shift to Codeset 5 |
0x9E | Non-Locking Shift to Codeset 6 |
NOTE: Those of you still awake will have spotted that the top bit (bit 8 in ITU-speak) is always set on single octet IEs.
All the IEs shown are in 'C' type hexadecimal values rather than the more normal bit format of ITU documentation - for our ease of use. You are welcome to convert them back to binary if that is easier to work with!!
Value | Name | Notes |
0x00 | Segmented Message | |
0x04 | Bearer | Required bearer service e.g. voice, data etc. |
0x08 | Cause | Error/termination code/status. |
0x0D | Extended Facility | |
0x14 | Call State | |
0x18 | Channel Id | Defines B channel being used. |
0x1C | Facility | |
0x1E | Progress Indication | Information about call in progress. |
0x27 | Notification Indication | |
0x2C | Keypad | Dialed digits. |
0x32 | Information Request | |
0x34 | Signal | Call progress info including |
0x38 | Feature Activation | one-octet format |
0x39 | Feature Indication | |
0x3A | SPID | infamous Service Profile Identification. |
0x3B | Endpoint Identifier | |
0x40 | Information Rate | Packet Mode (PMD) |
0x43 | Transition Delay | Packet Mode (PMD) |
0x44 | Packet Layer Binary Params | Packet Mode (PMD) |
0x45 | Packet Layer window Size | Packet Mode (PMD) |
0x46 | Packet Size | Packet Mode (PMD) |
0x4C | Connected Number | If a disconnect during CONFERENCE indicates the remaining caller. |
0x6C | Calling Party Number | Who is calling |
0x6D | Calling Party Subaddress | |
0x70 | Called Party Number | Who we are calling. |
0x71 | Called Party subaddress | |
0x74 | Redirecting Number | |
0x76 | Redirection Number | |
0x78 | Transit Network Selection | |
0x79 | Restart Indicator | |
0x7C | LLC | Lower Layer Compatability |
0x7D | HLC | Higher Layer Compatability |
0x7E | User-User | User-User Information |
Since these message types are National they are listed under the country/region. These IE's are preceded with a locking (0x95) or non-locking (0x9D) shift to codeset 5.
Value | Name | Notes |
0x01 | Operator System Access | Only in originating SETUP (User-Network) |
0x2A | Display Text | Formatted text for display |
Since these message types are typically proprietary or National they are listed under the vendor (or country) value. These IE's are preceded with a locking (0x96) or non-locking (0x9E) shift to codeset 6.
Value | Name | Notes |
0x3E | Protocol Version Control | |
0x41 | Closed User Group | |
0x42 | Reverse Charging Indication | |
0x75 | Redirecting Subaddress | |
0x7B | Call Appearance | Call Appearance number being used (Key system IE) |
Value | Name | Notes |
0x02 | User Code | Provides authorization info for calls (voice or data) |
0x21 | Associated Type | Provides call status for key systems |
0x22 | Selected Call appearance | Network says use this call appearance |
0x23 | Origination Call Appearance | The call appearance we are using for this call |
0x25 | Destination Call Appearance | On incoming call - should be same as last SCA |
0x26 | Endpoint Identifier | |
0x32 | Keypad Control | |
0x36 | Switch hook | 0 = on-hook, 1 = off-hook |
0x37 | Other Call Reference | Used in CONFerence operations |
0x38 | Feature Activation | two-octet format |
0x39 | Feature Indication | |
0x3A | Adjunct Control | |
0x3B | Display Control | |
0x3C | Display Field | 5ESS is very verbose |
0x7A | Management | used in MAN_INFO message types |
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