Does the iPhone SDK allow you to hook into a phone call's audio stream? For instance, could you programatically place a call and send data to a receiving modem? If so, would you kindly point me to the API documentation?
No, it does not. Sorry. You can't even programmatically place a call using the SDK, only open a tel://5551212 link which will end your program.
No, there's no access to the calling features of the phone in the current SDK.
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I want to create an iPhone app with following features:
User should be able to make a call to number.
App will play the prerecorded message when call get connected.
After playing the message, line will be connected and user will be able to communicate with the person to whom he made the call.
I heard that Apple doesn't allow the developers to interact with the calling functionality of iPhone but is there any way to achieve this. Please suggest!
Thanks-
You have heard correctly, According to Apple Developer Library, it is not possible to intercept the calling functionality.
Simple Apple does not allow such stuff with current sdk.
Not so sure but, May be possible for jailbroken iPhone app.
is it possible to wake an App in the background up, when a call comes in, and access CoreTelephony to send some infos over the web?
I'm practically a n00b in iOS development right now, but got asked a question if iOS is capable to do this. I searched in the iOS reference too, but with no luck.
It would be great if someone with more experience could answer it. Thanks a lot!
Steno
Please, have a look at the document about executing code in the background.
If you go to section "Implementing a VoIP Application", you will see that it is actually possible for your app to be awaken periodically so that it can check if it has anything to do (in your case, if I understand you correctly you would use CTCall to check for calling state).
So, basically, when awaken, your app could check for any incoming call and then use Core Telephony, as you say.
The only trouble about this is that if your app cannot be considered to a a VOIP app, Apple will not let it into the App Store.
It is not possible to have your code run when a call is received.
Is it possible to create an iPhone application to answer incoming voice calls and play audio files back to the caller? If yes, before answering the call, is it possible to determine the caller id?
Thanks!
This is not possible using the SDK. You can most likely do it with a jailbroken app.
iPhone applications (non-jailbreak apps, at least) cannot intercept phone calls. When a phone call is initiated, your app is paused and cannot execute any commands.
Essentially, count on never being able to prevent basic functionality of the iPhone. You can't override texting behaviour, Mail.app behaviour, Safari behavior, etc. because Apple wants the user experience to be consistent (not to mention security issues in allowing an app to answer calls on someone's behalf).
I've heard it mentioned elsewhere, one cannot programmatically hook into the phone call area of an iPhone using the current SDK. I'm looking to learn iPhone development and Obj C, with the end goal of creating a call timer app that runs in the background and alerts the user when a call has gone on too long.
Is it even possible to hook into methods liek that?
No. Your app will be interrupted when the user receives a call, and your code will not be allowed to run while the user is on the call. Additionally, there are no background apps allowed for the iphone. The best you can get is push notification, but you can't create a daemon or anything like that.
This information is provided in the iPhone Application Programming Guide
With version 4 you can now multitask to some degree.
I want to developed a application in iphone with objective-c that is retrieve all call details That we can show incoming, outgoing and Missed call. can this is possible that we can do this.
No, in a non-jailbroken device, with the public API, we can't do this.