Hello there,
I am new to freelancer, currently i am working on linphone based soft client for windows desktop. I have patched in linphone library for our company's requirement. I had developed android and ios based VOIP client on the top linphone library. you can check this application on this link : iphone:-[login to view URL] and android:-[login to view URL] application will work only with Matrix PBX. Look i am new in freelancer but i am fully aware of linphone, i have compiled linphone on all platform,patched in it. I am fully aware linphone core module(liblinphone api),mediastreamer, osip and exosip library(now linphone changed sip stack,new stack is belle-sip).
for your requirement point of view:
Client side:- you need to implement out of dialog info(or any other sip message) for balance information.
Server Side:- you need to implement info for balance inquiry. you also need reject invite with any 4xx code if balance is lower than cut off value.
Send me detail requirement of your project(if SRS is available then it is good for me). If you need changes in client side, than i will implement your requirement within 10 days(contain 2 or 4 Saturday). I have written 20 days, considering some extra requirement.
I am waiting for positive [login to view URL],
Regards,
Sandeep Gopani