TAILIEUCHUNG - Debug isdn q931 Command Call Setup Procedure Field Descriptions

Indicates the protocol discriminator; the protocol discriminator distinguishes messages for call control over the user/network ISDN interface from other ITU-T-defined messages, including other messages; the protocol discriminator is 8 for call-control messages such as SETUP; for the German ISDN switch type basic-1tr6, the protocol discriminator is 65 | debug isdn q931 Command Call Setup Procedure Field Descriptions Field Description TX- Indicates that this message is being transmitted from the local router user side to the network side of the ISDN interface RX - Indicates that this message is being received by the user side of the ISDN interface from the network side SETUP Indicates that the SETUP message type has been sent to initiate call establishment between peer network layers this message can be sent from either the local router or the network pd Indicates the protocol discriminator the protocol discriminator distinguishes messages for call control over the user network ISDN interface from other ITU-T-defined messages including other messages the protocol discriminator is 8 for call-control messages such as SETUP for the German ISDN switch type basic-1tr6 the protocol discriminator is 65 call ref Indicates the call reference number in hexadecimal the value of this field indicates the number of calls made from either the router outgoing calls or the network incoming calls note that the originator of the SETUP message sets the high-order bit of the call reference number to 0 the destination of the connection sets the high-order bit to 1 in subsequent call-control messages such as the CONNECT message for example callref 0x04 in the request becomes callref 0x84 in the response Bearer Capability Indicates the requested bearer service to be provided by the network i Indicates the information element identifier the value depends on the field it is associated with refer to the ITU-T specification for details about the possible values associated with each field for which this identifier is relevant Channel ID Indicates the channel identifier the value 83 indicates any channel 89 indicates the B1 channel and 8A indicates the B2 channel for more information about the channel identifier refer to ITU-T Recommendation Called Party Number Identifies the called party this field is present only in outgoing

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