hii all....am developing a code to implement RTP protocol...
the problem with the code is when I cal th function of the frame work...it give me error

ex:

res = iRtpAPI[apiId]->OpenL( aSdes, aRtpPacketDll, iSocketServPtr,
iConnPtr );

if ( res == KErrNone )
{

err = iRtpAPI[apiId]->StartConnection();

}
the err don`t equal to KerrNone
any on know the reason for this error?