227797 ⎘
Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
Sub-classes:Cloud-Based Call Routing
#2Cloud-based private branch exchange
#3Intercom system and data transfer method in said system
#4Marine switching system for providing time information and method thereof
#5Telephone exchange apparatus and incoming call control method for telephone exchange apparatus
#6Telephone exchange system and control method used for the same system
#7Portable interconnection system for incompatible audio communication networks
#8Telephone communication system and method of using