Pre-scheduled callback service

Premise-based voice bridge extension

Presence based callback

Presence information for telephony users

Presence information method and system

Prevention of call forwarding loops in communication networks

Priority call on busy

Privacy screening service for telecommunications

Privacy screening service with a bypass code

Private automatic branch exchange

Private branch exchange

Private branch exchange system

Private branch exchange with resumption of interrupted communica

Private branch exchange with self-referencing extensions

Private circuit provision in a telecommunications network

Private circuit provision in a telecommunications network

Private electronic exchange apparatus having a plurality of exte

Pro-active features for telephony

Pro-active features for telephony

Procedure for establishment of communication between two...