Call transfer system for PABX - allows subscriber to make transfer by dialling new number while holding first called party using stored data

摘要

The system applies to a p.a.b.x. with central control and storage and enables calls to be transferred without an operator. If one subscriber (T1) calls another (T2), the connection (1, 1') is made by a selector (VS1) and the data is stored (VsSpl). The subscriber (T1) then wishes to transfer (T2) to (T3), he presses his recall key. This connects him (2) to a second selector (VS2) which sends him dialling tone, while (T2) is held. The second store (VsSp2) receives the data (T1, T2) from the first store (VsSpl). (T1) then dials (T3)'s number, which overwrites his own number in the second store (VsSp2), and hangs up which frees the first selector (VS1). The second selector (VS2) rings (T3) and connects (T2) to (T3) (3, 3').