Question about the method isPendingData

I tried to use the method isPendingData(...) in a way like that:

SymmetricRTPSession* _socket_snd_rcv;
...

while (_socket_snd_rcv->isPendingData(tiempoEsperaMaximo) ... ) {
....
    adu = _socket_snd_rcv->getData(_socket_snd_rcv->getFirstTimestamp());
...
}

But when I compile the code, I got the following error:

/usr/local/include/ccrtp/rtp.h:501: `bool 
   ost::SingleThreadRTPSession<RTPDataChannel, RTCPChannel, 
   ServiceQueue>::isPendingData(unsigned int) [with RTPDataChannel = 
   ost::SymmetricRTPChannel, RTCPChannel = ost::SymmetricRTPChannel, 
   ServiceQueue = ost::AVPQueue]' está protegido (is protected)

¿How can I access this method or any method with similar function? I am
using ccrtp 1.3.6. on linux.

Thanks a lot!
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