Private network with means for establishing virtual tie trunks between PBXs through ISDN public network
A Standard patent application filed on 30 October 1991 credited to Hokari, Makoto
Details
Application number :
86889
Application type :
Standard
Application status :
CEASED
Under opposition :
No
Proceeding type :
Invention title :
Private network with means for establishing virtual tie trunks between PBXs through ISDN public network