1. A secure communications method, the method comprising: receiving signaling information corresponding to a secure real time packet stream; receiving a plurality of encrypted secure real time packets, said plurality of packets being a part of the secure real time packet stream, said secure real time packet stream using an implicit packet index for sequencing of packets in said secure real time packet stream, said implicit packet index being generated from a sequence number and a sequence number roll over counter number, said sequence number for each of said plurality of packets being included in each of said packets, said roll over counter number for each of said plurality of packets not being included with said packets; determining, based at least in part on the received signaling information, whether an adaptive index learning mode of operation or a second mode of operation is to be used for processing packets in said secure real time packet stream, said second mode of operation being a mode of operation in which a step performed in said adaptive mode of operation is bypassed; and wherein when it is determined that said adaptive index learning mode of operation is to be used storing in memory an indication that the adaptive index learning mode of operation is to be used and using an adaptive index learning process to determine a correct sequence number roll over counter number for one of said plurality of received packets, said indication that the adaptive index learning mode of operation is to be used that is stored in said memory is a flag stored in said memory that is set.