CONTENTS

 1     Scope
 2     Normative references
 3     Definitions and abbreviations
        3.1     Definitions
        3.2     Abbreviations
 4     Overview
 5     Configurations
 6     General model
        6.1     Reference configuration
        6.2     Protocol pillars
 7     Service definition
 8     Protocol
 9     Coding
10     Use of CCITT Recommendation X.3 parameters
11     Layer 1
       11.1     Basic access
       11.2     Primary rate access
12     Layer 2 protocols
       12.1     Layer 2 protocol for the D-channel
       12.2     Layer 2 protocol for the B-channel
13     Layer 3 protocols
       13.1     Layer 3 protocol for the D-channel
                 13.1.1     Terminal selection
                 13.1.2     Compatibility checking
                 13.1.3     Service specific use of supplementary services
                 13.1.4     Call progress signals
       13.2     Layer 3 protocol for the B-channel
14     Use of the Bearer Independent Service (BIS)
       14.1     Out-band procedure
                 14.1.1     Mapping of the BIS to Recommendation Q.931
                              14.1.1.1     BIS-N-CONNECT
                              14.1.1.2     BIS-N-DISCONNECT
       14.2     In-band procedure
15     Coordination between D- and B-channel