Extensions (EN)
ConceptInternal phone numbers in a telephone system
Architecture
flowchart TD PSTN[Public telephone network] --> PBX[Telephone system PBX] PBX --> Ext1[Extension 1] PBX --> Ext2[Extension 2] PBX --> Ext3[Extension 3] Ext1 -->|Internal| Ext2 Ext1 -->|Internal| Ext3 Ext2 -->|Internal| Ext3 Ext1 -->|Hardphone| Desk1[Phone at desk] Ext2 -->|Softphone| Laptop2[Laptop with software] Ext3 -->|Group| Team1[Team call group]