Just browsing DSE site for phone cable and saw this.
$3.48 for a 10 meters extension phone cable with Reel seems very cheap but the Reel is not that good. You can always use the cable and use tools to cut it and put the plug you want.
I think they are doing special on phone cables because the price on other cables also cheaper than before.
Also this one $3.48
http://dicksmith.com.au/product/F2131/digitor-10m-rj12-exten…
$1.75 even with ADSL filter but you may have to cut it to put the correct plug.
http://dicksmith.com.au/product/F2435/dse-adsl-extension-ree…
ah, the classic 600 series connector