U.S. federal trademark · Serial No. 78070231
Telecommunication Switches;PBX capable of routing a public dialed telephone number terminating on PBX "OVER" an ISDN Basic Rate Interface telephone voice circuit "BRI" to a specific PBX extension Such routing is defined in the industry as direct inward dialing "DID"
Source: USPTO federal trademark records. Informational only, not legal advice. Status and details may lag the live USPTO database.