ISDN Protocol Administrator's and Developer's Guide ... - Intervoice

Information ElementsVariable-Length Information ElementsVariable-length information elements can contain one or more octets.The following is the format of the variable-length information element:8 7 6 5 4 3 2 10 Information Element IDLength of Information ElementsMessage Content (multiple bytes)Figure 2-2. Variable-Length Information Element FormatThe information element (IE) identifier indicates the chosen elementand is unique only within a specific codeset. The length of aninformation element tells the receiver the number of octets that belongto the codeset.The available variable-length information elements appear in Table 2-2below:Table 2-2. Variable-Length Information ElementsValueDefinition0 0000000 Segmented Message0 0000100 Bearer Capability0 0001000 Cause0 0001100 Connected Address0 0001101 Extended Facility0 0010000 Call Identify0 0010100 Call State0 0011000 Channel Identification0 0011001 Data Link Connection Identifier0 0011100 Facility0 0011110 Progress Indicator0 0100000 Network-Specific Facilities60001262, First Edition IEs, Messages, and Supplementary Services 2-3