�1���� Introduction
�2����
Terms and definitions
01���� Tests
02���� Telephone set components
04���� Telephone set types
05���� Telephone set accessories
08���� Private telephone systems
10���� Telephone calls description
12���� Local line networks
13���� Telephone station usage
15���� Transmission performance
16���� Measuring apparatus
17���� Telephonometry
18���� Voice service measurements
19���� Speech signal processing
20���� Voice services: performance of an
automatic speech recognition system
25���� Video and multimedia services:
General terms
26���� Video and multimedia services:
Visual degradations
27����
Video and multimedia services: Video testing