How to trace GSM call is running or not, In VOIP apps running in device

[jai2713]

Hello All,

i have VOIP application, In this application before starting of any VOIP call. i wanted to first check is there any GSM call is running in device, if there is any GSM call don't connect any VOIP call.

if any one has the solution of this problem. Please help me.

Thank You

[pavarang]

Hello,
did you already have a look at CTelephony API?
This is a starting point:
http://www.developer.nokia.com/Commu..._of_CTelephony

regards
pg

[jai2713]

Hi pavarang,

I have already tried this stuff but i am unable to find the solution. My application is for VOIP calling and in this i want to track, Is any GSM call is running in the device before connecting any VOIP call.
If any GSM call is running i have to refuse the VOIP call.

Thank You

[vineet.jain]

More precisely see this link : http://www.developer.nokia.com/Commu...ith_CTelephony

Check in RunL() if the call status is connected or else(if connected then no Voip call otherwise continue with Voip calling)

[jai2713]

Hello Vineet,

Please see the below code (it is working in the case of GSM call during running voip call) but this time my need is just opposite.
If there is any problem please suggest me.

void CTelObserver::RunL()
{

if (iStatus == KErrNone)
{
CTelephony::TCallStatus status = iCallStatus.iStatus;
switch (status)
{
case CTelephony:: EStatusConnecting:
{
symbian_ua_anycall();
break;
}
case CTelephony:: EStatusAnswering:
{
symbian_ua_endcall();//star
break;
}
case CTelephony::EStatusRinging:
{
//symbian_ua_endcall();
break;
}
case CTelephony::EStatusConnected:
{
symbian_ua_endcall();
break;
}
case CTelephony:: EStatusIdle:
{
symbian_ua_endcall();
break;
}
default:
{

break;
}
}
// Start listening for the next call
StartListening();
}
}



Thank You

[vineet.jain]

As soon as your app is launched, you need to start listening for changes in GSM call status. This way whenever a GSM call is initiated(after your app is launched) you will get notified & you can then handle the Voip calling accordingly.

Right now when do you start listening for GSM call notifications?

[jai2713]

I am using start listening when any user successfully logged in through the application.

[vineet.jain]

yep that is correct.Make a call to your mobile from another phone & receive the call, now the status should be connected(take a bool variable let say & make it true this time). Next try making the Voip call & check for that bool , if its true then discard voip call else make the voip call.

NOTE: make sure to make the bool variable as false in case of disconnection of call.

[jai2713]

hello vineet,
i have tried this but it is not working, in case when gsm call is already running and then voip call comes.

Thank you

[vineet.jain]

There must be some notifications which you get when a Voip call arrives, so you can disconnect(CTelephony::HangUp()) the GSM call when that happens.

[jai2713]

I have tried (CTelephony::HangUp()) but its not working... GSM call could not Terminate. may be i am not using in proper way. could u please help me some other way..

Thanks You

[vineet.jain]

My mistake, Hangup() only works for the calls which are dialled by the app not for incoming calls. There are methods like using CHUP method of AT commands or a workaround of 'red/No' key simulation,so its upto you to use either of them. Search about these methods on forum itself, currently i am not able to do so due to some maintenance work which is going on with website.

[wizard_hu_]

Hanging up a voice call which is not owned by you requires NetworkControl capability. Anyway, if you plan to have the code signed for distribution, a VoIP call should not interfere with a GSM call as far as I remember (but I have not checked it now).
So far in this thread you wanted to detect ongoing GSM calls, that should be a fine direction. Try checking http://www.developer.nokia.com/Commu...Indicators_API if it helps.