Design of the application and SIP server based on Linphone-Linhome

Hello, Me and my friend we have created a SIP video intercom, we would like to start the production and sale of devices, but to get customers we need free applications and a server that will allow easy configuration. We are currently using the Russian application, but it is difficult to configure due to the need for port forwarding in the router. Not every client has the option of port forwarding, so we want to implement a free server in our database + free applications for our clients. The Linhome system is the perfect solution for this task, we have been testing for some time and it works stably with our intercom. I hope our requirements are not too high: A.) APP. We need versions for iOS, Android and Huawei are needed, and in them: 1. Adding our logo 2. Change of the graphic design 3. Linhome APP can add 3 DTMF opening buttons, we need 6 buttons in total. 4. Adaptation of the application only to our server .. eg: the ability to create a SIP account after scanning the QR code or entering the pin from the device sticker. 5. Applications must be adapted to phones and tablets. 6. A good solution will be to match the application with the horizontal and vertical tolerance of the screen. (Now Linhome on the smartphone is only vertical, I have not checked on the tablet). 7. Apps must work with push notifications, as is the case in Linhome, the phone wakes up from sleep mode when there is an incoming call. 8. Adjusting the security policy to be posted in stores. 9. Adaptation of the application to the copyright of Linphone / linhome. 10. Assistance in implementing the application to existing accounts in apple, google and Huawei stores. [login to view URL] B. Then we need to run flexisip on our own server (possibly + a replacement server in another location) with web support for creating accounts by clients. Here, before starting work, we need advice and arrangements regarding server hardware, administration panel, etc. [login to view URL] I am waiting for proposals and offers of cooperation. Best regards Daniel