I am having an interesting one way audio problem. We use 7921 wireless phones and 7911 wired phones. My problem is I am having one way audio problem when a 7911 calls 7921. 7921 can't hear 7911 but if I call from 7921 to 7921 there is no problem. One way audio problem doesn't happen always but when it happens 7921 to 7921 calls are without any problem. I checked 7921 s logs and saw 'No RX audio frame to DSP' errors. Can this be related with this error message?
No we don't have a firewall or router between wireless and voice VLAN. We have voice ssid binded to voice VLAN on our access points. We use AIR-AP1242AG-E-K9.
Already tried that didn't work but now a few mins ago I discovered our switches having topology changes nearly every second. Guess this is the problem, checking now..
I have solved TCN problems too, but still having the same problem. Already upgraded 7921 and 7911 firmware to the latest version. I getting 'No RX audio frame to DS' errors on 7921 phone when I have this problem. Any idea what this mean?
Problem solved. This problem is related with the codecs. I forced the phones to use just G.711 codec by disabling G.722 codec enabled parameter from System->Service parameters and the problem is solved. I read too much about one way audio problem through the net and saw that most people saying it can not be related with the codecs but it IS.
