Here we have a VoWLAN project troubled us long time. Could you give me some suggestions please?
The situation is that we deployed VoWLAN in our hotel customer this year. The wired network infrastructure device is Cisco switch C3560 and C6509, Call control is callmanaer 5.1, and the wireless infrastructure device is Aruba, including Aruba Wireless Controller and about 600 Aruba APs. The wireless IP Phones are Cisco CP-7921G and several old CP-7920G.
After a few weeks of use, we found that CP-7921G performed poorly in the hotel. In some corner of the room, 7921 loses voie stream during the session usually, sometimes we can't answer the call and one-way voice connection. But the RSSI and SNR on the corner is acceptable, which is about -65dbm and 26.
For the comparison, we found 7920 works better than 7921G, and can cover more bigger range. Therefore we contacted TAC for the problem, and TAC told me that 7920 has higher Tx power level(40mW) than 7921, so 7920 can work better than 7921. But by in searching the doc from CCO, I found that is not true.
So could you tell me what is real reason of the poor performance of 7921 in Aruba Wireless enviroment, even worse that 7920. And how can we resolve the problem? Any suggestions or solutions?
Thanks very much