In the content delivery you normally find the Cable kit Modem included :
1- RJ45 cale Ethernet (Cat 5E)
2- RJ11 / TT83 Phone adapter
3- Cable HF Wiclic DS30U, 3m (+ 1 Wiclic Adapter DV 26)
if you have not received CKM, do not try to buy cables you must have the original to have a good quality of service, u should simply contact customer service and request the sending of the pack.
I hope my answer will satisfy you.