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A tandem call is a connecting call in a telephone network, coming into a switch through one trunk and transferred out again through another. 

Call types

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Call ID

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Call type

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1

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Outgoing call

 

 

 

 

2Outgoing failed to connect call
50Outgoing operator-assisted call
100Answered direct dial call
101Answered transferred call
150Abandoned direct dial call
151Abandoned transferred call
200Internal call
250Internal failed to connect call
300Feature call
400Tandem call