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Hi I am getting confused with the Session Border Controller setup for Yealink T42. I have v15 3cx in one office and v15 session border controller in another. Both offices have Vigor 2830 Firewall/Router all firewall tests have passed. The phones behind the SBC work fine most of the time then suddenly we get one way audio.

The remote phones on the SBC are not on DHCP there is only 6 of them, static IP is setup and DNS. The phones are all Yealink T42G and I have followed the SBC setup and remote phones setup on 3CX website so on each phone I have

SIP Server 192.168.10.1 port 5060 - this is local IP of remote 3CX v15 system
Outbound Proxy 192.168.18.110 - port 5060 - this is local IP of the Session Border Controller
[attachment=2533]

However I noticed that in some instructions for setting up phones on remote it says outbound proxy should be 5080 but if I change this the phone will not register yet when I do change it to 5080 the phone appears in the Phones list ready for provisioning. If I set it back to 5060 the phone registers but shows as Not Supported in the phones list.
[attachment=2534]

Also keep getting these in the SBC logs
ERR | 20160815-120750.904 | 3CXTunnel | TUNL | 3300 | Rtp.cpp:143 | Error reading from RTP socket 476, {RS:56766}: error 10054
ERR | 20160815-120750.904 | 3CXTunnel | TUNL | 3300 | Rtp.cpp:143 | Error reading from RTP socket 476, {RS:56766}: error 10054
ERR | 20160815-120750.904 | 3CXTunnel | TUNL | 3300 | Rtp.cpp:143 | Error reading from RTP socket 476, {RS:56766}: error 10054
ERR | 20160815-120936.303 | 3CXTunnel | TUNL | 1504 | Bridge.cpp:694 | Has no registered RTP session for local destination 192.168.18.33:11806
ERR | 20160815-120936.350 | 3CXTunnel | TUNL | 1504 | Bridge.cpp:694 | Has no registered RTP session for local destination 192.168.18.33:11806
Hi,

Did you ever resolve this??

I have pretty much the same setup but have a Draytek 2920.

Any help would be appreciated.
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