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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 |
|---|
...
| 1 |
...
| Outgoing call |
| 2 | Outgoing failed to connect call |
| 50 | Outgoing operator-assisted call |
| 100 | Answered direct dial call |
| 101 | Answered transferred call |
| 150 | Abandoned direct dial call |
| 151 | Abandoned transferred call |
| 200 | Internal call |
| 250 | Internal failed to connect call |
| 300 | Feature call |
| 400 | Tandem call |