is there a way to access SIP headers when receiving a call?

[oojikoo]

when I make a call, it is possible to pass extra headers

let options = {
  headers: {
    "P-Assserted-Identity": "Header example",
    "X-UA": "React native"
  }
}

let call = await endpoint.makeCall(account, destination, options);

but how do I access SIP headers passed when receiving a call?