We have two Cisco 9971 phone operate in WIFI. Both phones are running sip9971.9-1-2 firmware. I can make calls to any wired phones or cell phones without any issues. However, calls between the two 9971 phone has no audio. The 9971 phone would ring but there is no audio when answering the call.
We also tested with 7920 and 7925 wireless phones, same issue. has anyone experienced the same issue?
Are the phones in the same vlan I would assume they are but if not I'd check this thread (
https://supportforums.cisco.com/message/1311515). I'm not aware off the top of my head anything config wise on the AP that would block basic switching of RTP packets at that point for the call audio to be switched between phones (layer 2). Since the phones ring, routing is fine to the CUCM and back to the phone(s) but direct RTP phone to phone on the same AP does not work.