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.
|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!!
|0x04||Bearer||Required bearer service e.g. voice, data etc.|
|0x18||Channel Id||Defines B channel being used.|
|0x1E||Progress Indication||Information about call in progress.|
|0x34||Signal||Call progress info including|
|0x38||Feature Activation||one-octet format|
|0x3A||SPID||infamous Service Profile Identification.|
|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|
|0x78||Transit Network Selection|
|0x7C||LLC||Lower Layer Compatability|
|0x7D||HLC||Higher Layer Compatability|
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.
|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.
|0x3E||Protocol Version Control|
|0x41||Closed User Group|
|0x42||Reverse Charging Indication|
|0x7B||Call Appearance||Call Appearance number being used (Key system IE)|
|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|
|0x36||Switch hook||0 = on-hook, 1 = off-hook|
|0x37||Other Call Reference||Used in CONFerence operations|
|0x38||Feature Activation||two-octet format|
|0x3C||Display Field||5ESS is very verbose|
|0x7A||Management||used in MAN_INFO message types|
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