VOIP app behavior at background (iOS 4.0+): Having a single socket that remains open, flagged as Voip This VOIP socket is maintained by the system, while app suspended at BG You may schedule a keep-alive block, and the OS will wake your app every X time X >= 10min (See [[UIApplication sharedApplication] setKeepAliveTimeout: handler:) this … Read more
You don’t give enough detail about your application. With any UDP streaming application you need to address the following issues: Network Jitter and Buffering: When a packet arrives, you cannot play the audio immediately after you receive it because the next packet might be later than expected and you will have a gap in your … Read more
On this thread from apple forums, someone from apple staff explained this: On iOS 13.0 and later, incoming Voice over IP calls must be reported when they are received and before the didReceiceIncomingPush() method finishes execution, using the CallKit framework, or the system will terminate your app. Repeatedly failing to report calls may prevent your … Read more
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You also need to ensure that you have set the in your pList file <key>UIBackgroundModes</key> <array> <string>voip</string> </array> The socket will be managed by the iOS while your application is in the background. Your application will receive the CPU time as soon there is a data available in the socket. So in the runLoop I … Read more
From android version 2.3 SIP API is added in Android. you can use either inbuilt SipStack library or third party open source sip stacks. Refer Android Developer’s Guide There are different open source sip stack libraries as well as projects are available on internet. You can download the source code of that projects. Here is … Read more
If you want to let your VOIP application run in background , except those base settings in plist file, you need a TCP socket who’s property is set to VOIP, than the iOS system will take care this socket for you, when your application enter background , every thing was ‘sleep’ except that tcp socket. … Read more
You may take a look at siphon (http://code.google.com/p/siphon/). From their homepage: Home of the World’s first free SIP/VoIP application for iPhone and iPod Touch 1 and 2. Siphon SIP/VoIP project is the first in his category that works on iPhone and iPod Touch 2 with headset for all SIP providers. It is a native application … Read more
I went through a similar quest 7 years ago, but looking for an embedded C version. I looked at the oSIP library. It did all the work of converting SIP packets to structures and back. However, one point in the documentation stuck with me. The author recommended that you become very familiar with the SIP … Read more