227724 ⎘
Automatic or semi-automatic exchanges; Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator Arrangements for signalling the number or class of the calling line to the operator
System and method for monitoring incoming communications to a telecommunications device
#2Methods for emergency response location (ERL) provision in a voice over internet protocol (VoIP) 911 server for non-direct inward dialing (DID) callers and related systems and computer program products