Contact person: APP Android from SIP to GSM

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Location: Mascara, Algeria

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need an Android application that can log in to a single SIP extension on my Asterisk server, accept an incoming SIP call, and immediately place an outgoing GSM call through the phone’s SIM. Once both legs are up, the app must bridge the audio in both directions so the remote SIP caller and the GSM callee hear each other in real time.


You will receive a fresh SIP username, password, and server address for testing. I’m fine with any reliable Android SIP stack—pjsip, native SIP, or another library—as long as audio latency stays low and call setup is quick. No particular codec restrictions are imposed, so choose what makes technical sense.

Deliverables:
• Signed APK (targeting current Play-compatible SDK)
• Full Android Studio project with readable, well-commented source
• Brief setup / build notes and a sample log excerpt showing a failed GSM attempt

I’ll test by routing live traffic through the app; once two-way audio, authentication, and logging behaviour all check out, the project is complete." (client-provided description)