We are looking for a straight forward Android application that communicates trough SIP protocol with a video door phone unit. We have enclosed the function specification of the client application as a PDF file. Keep in mind that we understand our product, how it works, etc. but we are no experts on development so it might be that you need to consult us with small things, e.g. on the implementation of a settings interface of the SIP server.
As I said the application is straight forward we expect you need approximately 6 weeks to develop the application, have it tested and "smoothened". If you can do it faster or require more time please let us know in your bid comment.