Looking for a UI/UX expert to create the UI/UX wireframe for our mobile phone app -- 2

We developing a mobile app that will make audio/video calls. We already have a mobile app with a design, color scheme, and branding for the chat side of the app. We are now adding audio/video calls including one-to-one and conference calling. As a good reference, you can refer to how WhatsApp and Telegram make one-to-one and group audio/video calls. The one primary thing to note is that we do not use mobile phone numbers for making phone calls so there will not be a dial keypad. We use sip addresses to make calls and each user will be assigned a sip address when they register into the app. The audio/video UI/UX wireframe will include: 1. How to initiate an audio/video phone call. 2. Show one-on-one phone calls in action and be able to switch between audio and video for both the caller and receiver. 3. Include a way to add additional individuals to start a conference audio/video call. 4. Show how drop from a call. 5. Intuitively show all the participates on an audio/vdieo calls in a nice, clean way. 6. When a person is speaking, their video should be on the mail call-in-progress screen. If they not using video, then their avatar should be on the main screen. If they do not have an avatar, then a default caller image should display with their "Alias" (i.e., their name) beneath it. 7. While the audio/video call is in progress, a shield (ie.., the company's logo) should underneath the message stating "Call in Progress" to indicate that this is a Secure (encrypted) call. These are the general items and of course, we can discuss this in detail once the project has been awarded. However, a major require is that you have done this before. You should already have a mobile app audio/video UI/UX wireframe that you have done in the past and we will use it to build from rather than starting from scratch. This is important because we want you to bring ideas to the project. If you have not done a UI/UX wireframe for a mobile app that does audio/video calling, then this is not the project for you.