hi,
we at Nexge technologies offer you a comprehensive list of VoIP solutions to choose from and what more...u get them done to your requirements.
Our VAS platform or value added services platform enables you to enhance your service providing capabilities,it includes(CUG or closed user group,CRBT or color ring back tone and much much more).
For more information visit our website at
www.nexge.com or email me at
bala@nexge.com
thank you!