Wholesale glossary
Network Efficiency Ratio (NER) measures whether calls handed into the chain reached the intended destination, regardless of whether a human answered. Unlike ASR, NER excludes subscriber behaviour, isolating what the network itself did: losses, routing failures and misdirected traffic.
Why it matters
NER separates nobody picked up from the chain lost the call. Interconnect SLAs and settlement disputes are argued in NER terms because both parties can measure the same handover points.
What practitioners watch
A wide gap between NER and ASR on a corridor means calls arrive and ring without being answered: dialler traffic, wrong numbers or answer-machine farming. A falling NER with stable ASR means the chain is leaking calls.
Related: Voice Transit Observatory · Routing Intelligence · PDD