SIP Dialer with VPN

HI, Looking to have a SIP dialer working on g723 and g729 with our voip switch with a pptp vpn client and openvpn integrated to it. We will provide vpn credentials and server details, we just need the dialer with vpn client support. As the app starts, user gets the option of ‘tunneling’ - enable or disable: If enabled, the user gets further 2 options, where the user can select any 1 – pptpd or openswan. The app works as per what user selects. Logo and icon to be suggested and will be approved by us. We would need total 4 copies of the app I.e. With different vpn credentials and brandname. Basic application would remain the same only theme color, vpn credentials and brandname will change. SIP / VOIP dialer standard / essential feature: Should work in iPhone and iPad Dialer accessing contacts Use of bluetooth, handsfree, speaker, mute, hold, dialer for DTMF, call duration. Skip / omit '+’ or ’00’ in the called number. Call logs / history of only voip calls. Balance display – Balance URL: [login to view URL] (3337 is the acc id) Integration with native dialer and auto start options. Speaker and microphone audio level. Echo cancellation and codec settings. Incoming calls support. Most important: if the app is running on background or is closed, the vpn should drop / disconnect. Terms: The project will only be considered complete once successfully published on apple store. The freelancers takes the responsibility to comply with all requirements or costs from apple store (if any). Apple account and cost for publishing will be covered and provided by us. Once project completed, the freelancers passes on all source files. Time frame: 3 weeks (21 days) from the date of award. 2 weeks for iso app 1 week for testing / bugs Payment terms: 25% – on start 30% - on completion of iSO app 45% - on apple store successful publishing