The New Service Provider (NSP) controls the port activation. Once the broadcast has been sent from the NPAC to all CLECs and the subscription is "active", the number has been ported to the NSP. At this point, CenturyLink has become the Old Network Service Provider (ONSP), does not have control of the ported number, and can not change any part of the subscription.
If the service provider is having problems with the broadcast, CenturyLink will work cooperatively with them to ensure that the routing information is correct and that the number will be ported.