SBC call drops and one way audio

[treefiddy]

Hi,

I've seen a few other threads from others experiencing this issue but never really resolved...

I have a remote location with about 30 phones on a Windows SBC and a few home users using the Raspberry Pi SBC. The location and few of the remote users are experiencing calls dropping and one way audio, both intermittently. There are a lot of errors in the log from the Windows SBC like below:

ERR | 20190501-120719.693 | 3CXTunnel | TUNL | 5728 | Bridge.cpp:712 | Has no registered RTP session for local destination 10.10.40.55:12534
ERR | 20190501-120834.295 | 3CXTunnel | TUNL | 2080 | Rtp.cpp:143 | Error reading from RTP socket 604, {RS:53746}: error 10054

Are these errors related to my issues or are they irrelevant?

 

[AWS2P]

errors speak about RTP and Rtp is for audio so i'm pretty sure they are relevant, are your SBCs up to date?

is your RTP port range open from 9000 to 10999 UDP

 

[treefiddy]

Yes, they were all downloaded and setup less than a month ago.

Edit: Firewall is off on the SBC and those ports are open on the 3CX host. Shouldn't that not matter though since the traffic should all be within the 5090 tunnel?

 

[AWS2P]

You are right, tunnel takes all

 

[AraldoJanes]

Hi....sometimes the users even refer to these as "dropped calls" because they get a call, there is no audio and after a few seconds they hear reorder tone, (fast busy), this happens because the caller cannot hear the called phone and it's getting dead air and hang up, or maybe they can hear the other end, but realize that the called phone cannot hear them and hang up.