Wanted is a part time developer to customize a SIP client for Android devices .
Some Similar Apps/Websites: Guroo , Africall , Linphone , ZOLPhone
Features: Email Signup/SignIn Social SignUp/SignIn (Facebook, Google, LinkedIn, Twitter) Social Engagement Subscriptions Shopping Cart Payment Processing User Analytics Crash Reporting SMS Messaging Real-time Chat Logo
Designs: UI Designs are ready (Some UI screens attached) / UI Designs are to be made. APIs Status: APIs are already developed / Need to be developed Backend Technology (APIs): APIs need to be developed in PHP/NodeJS Timeline: 3-4 Months
Send a Proposal if you can do it and I will send a detailed Requirement Documents for further discussion if I shortlist your Proposal.