Hold callkit call when incoming cellular call - ios

Question

I have a problem (but not really) with callkit.
I implemented callkit in my app and it works great. I can get a second call to my app and callkit offeres me options to End&Accept, Decline or Hold&Accept. Same goes if I am in a cellular (gsm) call and I get a call on my app. But when I am in app call (on callkit) and get a cellular(gsm) call I only get 2 options: Decline or End&Accept.
Any idea why? Or how I can get all 3 options?
static var providerConfiguration: CXProviderConfiguration {
var providerConfiguration: CXProviderConfiguration
providerConfiguration = CXProviderConfiguration(localizedName: "app name")
providerConfiguration.supportsVideo = false
providerConfiguration.maximumCallsPerCallGroup = 1
providerConfiguration.maximumCallGroups = 3
providerConfiguration.supportedHandleTypes = [.phoneNumber]
return providerConfiguration
}
I have implemented:
providerDidReset,
CXStartCallAction,
CXAnswerCallAction,
CXEndCallAction,
CXSetHeldCallAction,
CXSetMutedCallAction,
timedOutPerforming action,
didActivate audioSession,
didDeactivate audioSession.
In my app delegate I have function that checks useractivity. I put breakpoints in all of the functions but nothing gets called before the view for incoming cellular (gsm) call is shown.
I googled but couldn't find the solution. As far as I can see, callkit is working perfectly.

Answer 1

I struggled with this for outgoing calls. For outgoing calls, make sure you call this method for the call once it is answered by the remote side:
[self.provider reportOutgoingCallWithUUID:currentCall.uuid connectedAtDate:[NSDate date]];
If you do not, the call is stuck "connecting" from CallKit's perspective and I have found that the native incoming call UI for other calls will not provide the "send to voicemail" and "hold and accept" options for incoming calls while another call is "connecting".
I struggled with this for a bit today until I figured that part out. I also am calling:
[self.provider reportOutgoingCallWithUUID:currentCall.uuid startedConnectingAtDate:[NSDate date]];
from within:
- (void)provider:(CXProvider *)provider performStartCallAction:(CXStartCallAction *)action
Not sure if that part is necessary but I'm doing it because that's what the Speakerbox demo does. Kind of, they do it in a callback... I just do it immediately.

Answer 2

While you were sending CXCallUpdate object to CallKit before calling, make sure you kept supportsHolding value as true.
My CXCallUpdate looks something like below:
let callHandle = CXHandle(type: .phoneNumber, value: handle)
let callUpdate = CXCallUpdate()
if userName != nil{
callUpdate.localizedCallerName = userName;
}
callUpdate.remoteHandle = callHandle
callUpdate.supportsDTMF = true
callUpdate.supportsHolding = true
callUpdate.supportsGrouping = false
callUpdate.supportsUngrouping = false
callUpdate.hasVideo = false
Meaning of above different properties:
localizedCallerName = If you want to show name of user on system's call screen, otherwise phone number/email based on type of handle will be shown
supportsDTMF = On system's main screen, if you want to allow keypad numbers to be typed while call is running, if you make it false, keypad option get disabled.
supportsHolding = If you want your call to be held, when some other call get triggered, keep this property true
supportsGrouping = If you want to allow conference calling(Merge call option enabled in calling screen), then keep this one true
supportsUngrouping = Inverse of last one, After call getting merged(conference call), should allow it to ungroup or not.
hasVideo = If you support video call, the system will automatically start camera for you.
#Redssie, let me know if any further help related to Callkit required.