Vitor Santos wasn't phoned on the OC main line at all. My research indicates that the calls were to other staff members. Luis Barros, Nelson Rodrigues and Jeronimo Salcedas were phoned after the GNR calls.
Thanks to a bit of interchange, this has been clarified quite a bit.
The Ocean Club had a landline system capable of 100 extensions. The only time the records show the full-length number is if the base number is used. All other extensions record as two digits shorter - you do not get the extension number. Therefore, you do not know from the record who is making the phone call.
G-Unit is right about the calls after the GNR was phoned. Using the GNR records re staff interviews, the calls can be matched. None of the numbers matches Vitor's number. The numbers match staff as above. These would need to be cross-referenced by who called whom, but they seem to fall into the general category of internal alerts from one member of the OC to another.
The PJ Files also show a mobile number for the OC. This may have been used to phone Vitor, and would not show up in the landline OC records. Since the mobile traffic in the PJ Files is for the Tapas 9, armchair sleuths are not able to check if Helder used this method or not. Why he would is a puzzle.
Bottom line is there are 2 landline calls to the GNR, and both Helder and Vitor say a call to Vitor was after the GNR calls. Vitor then says he took 10 to 15 minutes to get from Lagos to OC 24hr reception, and that when he arrived, the GNR were talking to Gerry in reception.
And that pushes the time the GNR arrived at 5A beyond 11pm. As to when the GNR search actually began, over to you.