openser kamaillio + asterisk + a2billing server

hello i need amailio + xmpp module + asterisk + a2billing to be configured in my server to be ready for voip and sip i want to use him for 1. Audio Call 2. Video Call 3. Chat/ File Transfer 4. IVR, Voicemail 5. Call Plan, Billing, Voucher ,top please i want i skilled developer in this area i don't have much budget for this project so the low end bid will be hired and thanks