We used Faktortel as a small business and they were satisfactory. We originally were using ADSL2+ which was considered 'sufficient' to handle Voip, however the call quality was poor. I don't think this is fault of Faktortel however their sales team were keen to sign us up giving a false sense of assurance. Because the call quality was so bad we had to rely on a fixed Telstra line for all incoming calls. Faktortel had sold us new units called DX800A which has the ability to take incoming calls from a fixed line and make outgoing calls via Voip lines, however these phones are not suitable if you have more than 1 person in the office. There is no transfer function and the phones often didn't work 100%. Often a call would come in and the caller would not be able to hear us unless we quickly hung up the phone and manually selected the line they had called on. Very frustrating! We had tried several times to have our troubles resolved by purchasing additional handsets, Faktortel accidentally sent us the incorrect handsets and refused to send the correct handsets until we had returned the units that were shipped incorrectly. This cost us several days using an ad-hoc solution, diverting to mobile phones when the existing handsets were busy, which ended up costing much more and affected our business service levels to our customers substantially.

Their rates are very competitive, but keep in mind they still charge you for internal calls/transfers. I have not found any other Voip providers to charge for this.

Their business continuity and SLA was tested and failed during the Brisbane floods. From what I understand they rely on the AAPT server in the city, due to this being flooded all our Voip lines were disconnected. We were lucky that our Voip lines were not advertised and our customers were contacting us via the fixed line we had kept (just in case). Voip lines were not able to be diverted or redirected in anyway.