Our client was looking for a partner experienced in custom development to build comprehensive software for telecom market. The delivered product included such features as VoIP billing solution, VoIP softswitch with HA and extreme scalability built on top of Erlang/OTP, Customer portal and full-featured UI. About project Our client was looking for a partner experienced in custom development to build comprehensive software for telecom market. The delivered product included such features as VoIP billing solution, VoIP softswitch with HA and extreme scalability built on top of Erlang/OTP, Customer portal and full-featured UI. Case study Our client was looking for a partner experienced in custom development to build comprehensive software for telecom market. The delivered product included such features as VoIP billing solution, VoIP softswitch with HA and extreme scalability built on top of Erlang/OTP, Customer portal and full-featured UI.