Requirements
A phonetariff with type "Sale" and a phonetariff with type "Purchase" needs to already exist. Please refer to Add a PhoneTariff
Steps for assigning a Phonetariff to a Contract
Go to Provisioning > Contracts
Click on the Plus-Button under "Assigned Items" on the right side of a contract's edit-page.
Choose the VoIP Product and fill out the form by setting a start date. If you are done, click on Save.