Connections
telephone call
Entity
telephone
Entity
International Standard Book Number
Entity
telecommunications
Entity
alternating current
Entity
direct current
Entity
Voice over IP
Entity
theatrical property
Entity
root mean square
Entity
telephone exchange
Entity
ringtone
Entity
phreaking
Entity
business telephone system
Entity
plain old telephone service
Entity
blue box
Entity
intercom
Entity
Caller ID
Entity
handset
Entity
ringback tone
Entity
analog telephone adapter
Entity