VoIP wholesale business as any kind of business has its specific failure risks. The main risk is not to get money from your clients. It may happen when a wholesale provider uses a postpaid type of payment while selling traffic. There are several ways to minimize this risk. Firstly, work with partners who have market experience and are well-known among the VoIP community. Before starting cooperation with a partner ensure yourself using anti-fraud forums (for example, on www.voipfraud.net/en or in special sections on VoIP forums) that he hasn’t been involved in VoIP fraud activity and check information about the company (http://www.domaintools.com/). Secondly, check the company registration documents, make sure you deal with a real company.

Finally, after signing the agreement you should always keep in touch with your partner. 

Another way is to work via prepayment. But there can be difficulties if you are a brand-new company. Big market players usually don’t prepay to small and unknown companies.  

Be careful while signing the contract. To avoid risks of disputes or fraud activity you should pay attention to such aspects as a type of payment (prepaid or postpaid); billing conditions – per second/per minute; bank details presence; terms of confidentially, etc.

Additionally, there is a common FAS (False Answer Supervision) problem. It means incorrect extra billing of calls because some calls are billed without connection to the subscriber. You should avoid cooperation with companies that have too much FAS. There is a risk that your customers won’t pay for these calls, although your suppliers will include them in their invoices.

You can identify FAS when ASR is higher than average, but ACD is lower or the same. 

Actually, you can’t avoid the risks but checking for instructions helps to minimize them.