Voip App Based On Freeswitch (Windows OS)  

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I am looking for an experienced Voip Developer in PHP.

Application should support as bellow:
--Authentication methods.(user ID / IP / MAC or ANI)
--Internal calling user to user + International Calling .
--Alias with DID Maping
--PSTN ( over SIP)calling/ billing
--DID forwarding
--Call forwarding
--Call forwarding on busy
--Call forwarding on no answer
--Voicemail- Simple Text Reader +(translation).
--PIN request.
--LCR(Least Cost Routing) / Carrier route
--Enum Support
--Video calling should support.
--NAT traversal support (RTPproxy, Mediaproxy or same like SBC)
--Text Messaging
--Webphone
--Callthrough
--Click to Call (Callback)
--IVR (Tell the Balance every time user call).
--Web Call Back
1 Customer enters source and destination numbers in Click to Call back web page.
2 System calls source number
3 When user picks up the phone, he is connected to destination number
4 Ability to activate/deactivate service at any time
5 call should disconnect when the user go to negative balance.
6 user should send to IVR when the balance is negative.

Over all Features:

Authentication
Calling Card script
Client (PAP2)Devices Support + Mobile Users support.
Active Call Statstic.
Siptrace
Identify the call problems.
Real time billing and reports
Reseller Modules (4 Level of Reseller Account )
(Note : I have a working Reseller Web Panel .I can provide those if needed Written in ASP.Net)
Call Back
IVR
NAT traversal support
Video Call
Internal user call.

- Development of userinterface and admininterface, possibility to edit the services listed Above
- Implementation of additional payment methods (paypal, moneybookers etc)
- Optimizations for Future Re-Used (mod rewrite ,urls, css, valid HTML)

(Note : I have a Reseller Panel working on Web .I can provide if needed written in ASP.Net)