Hi, I'm a software developer and I'm making softaware for a customer to call SIP speakers via a network phone (One Way). Your software is perfect for this, thanks for that and I have already progressed in programming.

I have two problems

1. I need to notice the sound after starting a SIP call. Like the tone of attention at airports. After that we start talking to speaker.

2. Can I play sounds that have already been recorded? So I need code examples for that cases

I would like to manage these with my own PHP/JavaScript program browsers. Buying a license will definy come up. Do you have a developer license? We don't need a server, because we have SIP server. Webphone software only.