IPC Subgroup
H04M 1/82 Line monitoring circuits for call progress or status discrimination
Introduced: January 2000
Last revised: January 2006
Full Title
Substation equipment, e.g. for use by subscribers > Line monitoring circuits for call progress or status discrimination
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION