Answer to Seizure ratio.
This helps in know how many calls were answered out of Total attempts.(Total attempts include Calls answered+calls not answered+calls not possible due to network congestion , in simple terms the all Circuit seizures)
This is an indirect indicator of how much revenue can be generated.
Normally Answer to Seizure Ratio is taken for trunks between two Network Elements. For eg Between MSC & PSTN Routes, MSC&BSC etc