enum MtasChargingProfileTermCcaUpdateEvaluationDT

Numeric Enumeration: 0-1(0=SYNCHRONOUS, 1=ASYNCHRONOUS)

References from:
MtasChargingProfile;

0
SYNCHRONOUS
When MMTel AS sends CCR (Update Request) after called party answers, then MMTel AS waits for the CCA-U.
1
ASYNCHRONOUS
When MMTel AS sends CCR (Update Request) after called party answers, then MMTel AS doesn't wait for the CCA-U. MMTel AS forwards the received 200 OK (initial INVITE) immediately to the remote user.