I have to create VOIP app for IOS and ANDROID
I have my own Sip,
1.for example all VoIP mobile apps which contain ( Proxi) in that entrance you of to enter a sip-number as long as you are linking a service through that provider..
just check the Example VoIP-app (Zoiper ) in config section > (Outbound Prox) this must appear automatic> (my SIP)
2.Another Example a VoIP-mobile must have a (Features) Built in > ( DTMF) which Contain ( Disable/RFC-2833/sip info/inban,
3.And Video-codec should be set on Automatic'
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More details will be given after an interview.