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Develope a software for our initial business venture. We are in need of a proprietary voice-over-Internet Protocol (VoIP) core software application with client software that should cater to the 4 major platforms - Windows, Android, IOS, Mac. The service should allow users to communicate with peers by voice, video, and instant messaging including but not limited to SMS over the Internet. Phone calls may be placed to recipients on the traditional telephone and mobile networks - (SIP to PSTN / GSM and vice versa). Calls to other users within the service are free of charge, while calls to landline telephones and mobile phones are charged via a debit-based user account system. Primarily, "Interoperability" should be the key. The proposed software should be a hybrid peer-to-peer and client–server system. It should make use of background processing on computers running the software. In short, it should function much alike with Skype. **Philippine based developer is an advantage** Please The Administrator removed this message for containing contact details which breaches our Terms of Service