VoLTE Traffic formula in Erlangs

Dear Experts.
What is VoLTE traffic formula in Erlangs?

Vendor Huawei.

LTE traffic unit of all QCI is: bit/byte, not has Erl.
But it has counter about: PDCP-Layer Data Transmission Duration (ms) per QCI
You can refer from duration of PDCP data transmisison for QCI1 in hour as Erl.