I know one way to make a call. It is something like this:
private func facetime(phoneNumber: String) {
if let facetimeURL: NSURL = NSURL(string: "facetime://\(phoneNumber)") {
let application: UIApplication = UIApplication.sharedApplication()
if (application.canOpenURL(facetimeURL)) {
application.openURL(facetimeURL);
}
}
}
And I know about VoIP SIP client. But is there another way to make a call which uses GSM gateway inside my app on a device without jailbreak?