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RTP Stream is empty

Hi , really hoping someone can help me figure this out.

I have a voice lab setup for university, using Cisco CUCM 11.5 as my call manager and two Cisco IP Communicator phones for my endpoints. So far, I have been able to make successful calls between the two devices and I have captured the RTP streams with Wireshark.

However, when I go to play them back, the RTP stream shows up empty or won't decode. I tried to download a test capture file and play it back, which worked. I have played around with the codecs and signalling protocols but I am not having any luck. I would upload the pcap file but I don't have enough karma. Can anyone help me figure this out?