Sonus started displacing Huawei some 6 months back at Convergia. Actually as a first step Convergia stopped investment in Hauwei. They went back to original infrastructure and then selected Sonus to replace the systems.

Convergia had deployed Huawei NGN gear some 3 years back. At the time it was supposed to be biggest Huawei NGN deal outside China: “One of the largest cross country VoIP networks - 17 countries.” See slide 19 of this presentation.

Convergia then took Huawei to court in 2006.