frequency u01926 1150 hz is detected in any ttmf tone then this ttmf tone is an s ttmf flag signal that may also embody the integer portion of a voice video quality measurement result the second type of flag signal the e ttmf flag signal also has two functions a indicating the end of the played voice video sample testing file and b representing the two digit decimal portion of the voice video quality measurement result for example with reference to the same pesq score of 4 23 the two digit decimal portion of the score 23 would be encoded into and sent out with the e ttmf the first function may be easily implemented by not using the special frequency f6 in any e ttmf flag signal because this special frequency is used only by the s ttmf flag signal thus the e ttmf flag signals may be implemented as shown in table 3 fig3 is a signal flow diagram 300 of an example implementation of the file play record process in a cfpr vvqt system that utilizes the ttmf start and end flag signals shown in tables 2 and 3 to implement continuous bi directional voice and video quality testing without the synchronizing shown in fig2 the left column represents those processes taking place in vvqt.