I just upgrade UC520 to 8.0.4 package, and now my Phone Cisco7906 at remote Home lost audio stream.
The Cisco7906 can register with UC520, can make and receive call but there was no audio.
Tried to test another phone Cisco7960G, the problem still the same
But the software phone Cisco Communicator with same condition version 220.127.116.11, making call and receiving call was OK
For the 03 cases above the remote phone was setup with mtp command in ephone configuration.
I think there is problem with audio stream port 2000 with these hardware phone with remote connection
The local phone at the main office are working well (Cisco7906, Cisco7940)
I have used UC520 more than 2 years, and my setup was as follow :
UC520 in the main office with EASY VPN Server and SPLIT Network enable for Data, VOICE VLAN subnet
Cisco877 in remote Home, with EASY VPN client. IP Phone was in the LAN side of Cisco877 and was NAT to using this VPN to connect to UC520
With firmware 7.1.1 in UC520 before, the Cisco7906 at remote Home was working well, but now with firmware 8.0.4 it didn't work anymore.
I wonder if this is bug with new firmware 8.0.4 ?!
Please help to fix this problem, or advise can I downgrage back UC520 to 7.1.1 ?