Flutter App - Designs Ready - Need to integrate VoIP SDK only

Hello everyone,
There is a FLUTTER project for which designs are already prepared.
Please find the zip file attached with the designs.

Need to only integrate this VoIP SDK: https://voipsipsdk.com/products/voip-sip-sdk-for-flutter/features

Here are some features we want from that SDK:
-- Voice Call;
-- Call Transfer;
-- Conference Room;
-- Record Calls;
-- Call on Hold;
-- Call History;
-- Contact List;
-- Settings: User information; SIP settings;
-- Authentication with license

Final output will be the Android and iOS project with the SDK integrated for all these screens.
Source code will also be shared for analysis with the chosen candidates.

TERMS: 100% Payment will be funded to Escrow, but will only be released once project is complete and approved by the client.
Please submit a bid only if you agree to the above and are sure of delivering on the project.

Best of luck!