Custom DID Number //Toll Free numbers// Premium numbers management portal

We need an experienced developer in server in the following ; openfire +opensips +asterisk +a2billing.... loadbalancing,failover , media proxy, natting.... Summary ............... The idea is to build a redundant system that can scale with a click of a button It will be a portal to purchase phone numbers //Toll free Number //Premium numbers and option to forward to SIP, Softswitch, Regular number,skype,fax2email Highly secure to Brute force and other attacks. We would also need custom PBX with user friendly interface Both Admin panel and end user panel has to be neatly designed ( custom made based on our requirements ) and attractive and at same time upgrades to Opensips/Asterisk/a2billing should be possible from time to time without affecting front hand or backhand working Details of project will be shared before awarding project.