Nsa Anchor

[eimanrazak]

In which messages can we check the Anchor ID of the NSA?

[doqg]

I guess you can check it in Attach Accept or Reconfig msg.
Look at carrierFreq (EARFCN) → b7

source: How LTE Stuff Works?: LTE: RRC Connection Reconfiguration

Edit: this is a really good question.