Solved No audio on SBC calls

[sevenvoip]

Have my 3CX hosted with Amazon Lightsail and using an SBC to get to it. SBC is shown as green and connected, but no phones internally have audio. If I use STUN, it works without issue. I have "PBX Delivers Audio" checked on all extensions. I also have this similar setup at 23 other locations without an issue. Any ideas?

3CX Version 18 Build 1880 (Newest Release)
SBC Version 18.0.27
All firewall checks pass

 

[Evolute IT]

Have my 3CX hosted with Amazon Lightsail and using an SBC to get to it. SBC is shown as green and connected, but no phones internally have audio. If I use STUN, it works without issue. I have "PBX Delivers Audio" checked on all extensions. I also have this similar setup at 23 other locations without an issue. Any ideas?

3CX Version 18 Build 1880 (Newest Release)
SBC Version 18.0.27
All firewall checks pass

Can you disable "PBX Delivers Audio" and try again? That should only be enabled for STUN phones or when you have issues. But it can also cause some.

 

[leejor]

Does this affect internal calls only, or external as well? Are the other sites also using version 18?

 

[Alphabetic]

Is your PBX passing the firewall test?

 

[sevenvoip]

Can you disable "PBX Delivers Audio" and try again? That should only be enabled for STUN phones or when you have issues. But it can also cause some.

I can't disable it because they are having to use STUN at the moment to answer calls, but yes, that is something I tried earlier to no avail.

 

[sevenvoip]

Does this affect internal calls only, or external as well? Are the other sites also using version 18?

All calls. Yes, the others are running version 18

 

[sevenvoip]

Is your PBX passing the firewall test?

Yes. I ran it twice to make sure. All have passed.

 

[Evolute IT]

Are you doing any kind of QOS on RTP in the SBC-site?

 

[Saqqara]

What model of phones

 

[sevenvoip]

Are you doing any kind of QOS on RTP in the SBC-site?

Nope. I have a Unifi Dream Machine

 

[leejor]

It sound like an issue created by a piece of hardware at that site...switch, or router.

 

[Evolute IT]

Please run a packet capture on the PBX, on the SBC and the phone at the same time and make some test calls.

The RTP must be going somewhere. Do you have outbound audio? Like if you get a call, you can't hear them or they can't hear you? Or both?

 

[Alphabetic]

What hardware is the SBC set up on and is the time correct?

 

[Saqqara]

What happens if you do an echo test , dial *777 on one of the phones

 

[sevenvoip]

I went onsite to do further testing. Just so happened to pick a phone call with speaker phone and it worked without issue...

They had plugged the handset cable in the headset slot. Sorry for all the troubles. This has been crushing me for two plus hours now

 

[Evolute IT]

I went onsite to do further testing. Just so happened to pick a phone call with speaker phone and it worked without issue...

They had plugged the handset cable in the headset slot. Sorry for all the troubles. This has been crushing me for two plus hours now

Code 18 lol or PEBKAC

 

[Alphabetic]

That's funny

You must be so relieved..

 

[Evolute IT]

That's funny

You must be so relieved..

It was really odd to have audio issues with the SBC... Let's be honest, that thing is rock-solid.

 

[Alphabetic]

It was really odd to have audio issues with the SBC... Let's be honest, that thing is rock-solid.

Yeah... but we've all been there...

spent a long which frustrated because you've tried everything complex in your arsenal only to discover it's the simplest thing to fix!

┬─┬◡ﾉ(°^°'ﾉ)

 

[JohnS_3CX]

I went onsite to do further testing. Just so happened to pick a phone call with speaker phone and it worked without issue...

They had plugged the handset cable in the headset slot. Sorry for all the troubles. This has been crushing me for two plus hours now

Don't worry about it, We've seen this happen one too many times! Glad to hear it was solved