Systems providing special services or facilities to subscribers

Full Title

Automatic or semi-automatic exchanges > Systems providing special services or facilities to subscribers

Classification Context

Section:

ELECTRICITY

Class:

ELECTRIC COMMUNICATION TECHNIQUE

Subclass:

TELEPHONIC COMMUNICATION

Child Classifications

Navigate with arrow keys, Enter to open

• H04M 3/424 Arrangements for automatic redialling
• H04M 3/428 Arrangements for placing incoming calls on hold
• H04M 3/432 Arrangements for calling a subscriber at a specific time, e.g. morning call service
• H04M 3/436 Arrangements for screening incoming calls
• H04M 3/44 Additional connecting arrangements for providing access to frequently-wanted subscribers, e.g. abbreviated dialling
• H04M 3/46 Arrangements for calling a number of substations in a predetermined sequence until an answer is obtained
• H04M 3/48 Arrangements for recalling a calling subscriber when the wanted subscriber ceases to be busy
• H04M 3/487 Arrangements for providing information services, e.g. recorded voice services or time announcements
• H04M 3/5 Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers
• H04M 3/54 Arrangements for diverting calls for one subscriber to another predetermined subscriber
• H04M 3/56 Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
• H04M 3/58 Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party