telecommunication exchange
preferred label: تبادل مخابراتی @fa
type: Concept
narrower: telephone exchange

telephone equipment
preferred label: تجهیزات تلفن @fa
type: Concept
narrower: telephone exchange

private telephone exchange
preferred label: تبادل تلفن خصوصی @fa
type: Concept
broader: telephone exchange

telecommunication switching
preferred label: سودهی مخابراتی @fa
type: Concept
related: telephone exchange

telephone line
preferred label: خط تلفن @fa
type: Concept
related: telephone exchange

telephone exchange
related: telephone line
related: telecommunication switching
related: telephone traffic recording
scope note: exchange (telephone)
type: Concept
broader: telephone equipment
broader: telecommunication exchange
narrower: private telephone exchange
preferred label: مرکز تلفن @fa
alternative label: exchange (telephone)

telephone traffic recording
preferred label: ضبط شدآمد تلفنی @fa
type: Concept
related: telephone exchange