SIP Softphone

I am looking for a developer to create a SIP Softphone that is compatible with Android operating systems. The main requirement of the Softphone is to make phone calls. I should be able receive inbound calls and read any dtmf tones

Ideal skills and experience for this job include:
- Experience with SIP Softphone development
- Strong knowledge of Android operating system
- Experience with VoIP and telecommunications
- Familiarity with SIP protocol
- Strong attention to detail and ability to deliver high-quality work
- Excellent communication skills to ensure project success.