Yes...If you want telkoms warrenty thing. The are normally quite cheap but if you get the adsl modem from telkom they will supply it. If you get another brand the normally made one for it. That is an added cost of like R170.00
Trust me, it's worth it. Lost a Netgear DG834 to lightning during the holidays.
I had to buy a D-Link 504T or be without internet for two to four weeks. Yes, I'm addicted, hehe. Very happy with the D-Link btw, it's a bit cheaper than the Netgear and supports bridge mode.