there are 2 stock for telstra corporation
TLS and TLSCA
i dont really know the difference between this 2 quote but i might know its movement.

TLS and TLSCA price could go down during the day 13/07/2007 but if we view 1 year price chart for that 2 stock, we will see they have an up trend at the moment, so try to buy TLS and TLSCA at the lowest price today and they will go up next couple of days. Good luck everyone
source:
Australian Stock Pick for Week Trader