Add Auth user name to linephone for Android

hi, I would like to add "authentication user name" to the linphone Android parameters. Today I can set from the configuration menu the username and the password only. I would like to provide my customers 1. DID (the current user name) 2, Auth user name - need to be added 3. Pass The auth user name will be used in the INVITE and REGISTER autherization SIP header: username ="" according to RFC 3261 I saw that the code is supporting auth user (called "userid") but it is in the low level and not in the linphone GUI parameters, This is a very common parameter in many sip device. you can download x-lite or look at PAP2 configuration in order to understand how it should work. The freelancer will have to provide the source code and all the diff from the original source code. That's all! Amos