let sessionID = "12345" //you can set anything
let callView = UIView()// a UIView you want to show the calling view in
let callToken = ""
let callSettings = CallSettings.CallSettingsBuilder(callView: callView, sessionId:sessionID).setAudioOnlyCall(audioOnly: true).enableDefaultLayout(defaultLayout: true).build()
CometChatCalls.startSession(callToken: callToken, callSetting: callSettings, view: callView) { success in
print("CometChatCalls startSession success: \(success)")
} onError: { error in
print("CometChatCalls startSession error: \(String(describing: error?.errorDescription))")
}