Solved Yealink phone + Mobile Apps not working under same network.

[proitek]

Hosted with 3CX
Up-to-date
All phones are up-to-date
Phones and Mobile Apps are working outside network


On the same LAN, each are behaving in the same way.
The phones provision ok - buttons etc. Phone calls ring into the phones - on a bit of delay but they ring.
No audio when I answer AND outgoing calling doesn't connect at all.
Outbound calls got error : Invite request no response!

There are no errors in the dashboard.
Phones are configured for Direct SIP (STUN-remote). Tried PBX delivers audio. No difference.

According to our IT Dep the port are open(see image bellow)

 

[GeorgeP_3CX]

Hi @proitek,

Please note that STUN provisioned IP phones are not supported with 3CX Hosted Installations.
As per our guide, the IP phones must be configured behind a 3CX SBC.
https://www.3cx.com/ordering/pricing/hosted-info/

Try provisioning the IP phones using the 3CX SBC and see if that resolves your issue.
You can find the provisioning guides for all the supported IP phones here: https://www.3cx.com/sip-phones/

 

[proitek]

@GeorgeP_3CX Hosted with 3CX and the phones are Direct SIP (STUN-REMOTE)

 

[bitn2]

@GeorgeP_3CX Hosted with 3CX and the phones are Direct SIP (STUN-REMOTE)

You need to use a SBC when hosted by 3cx. @GeorgeP_3CX said it already.

 

[proitek]

Ok I'll try that.

So you telling me that I need to use SBC on every customer using 3CX or it's not gonna work?
Because I have around 15 clients using STUN-REMOTE and it's working perfectly.

 

[bitn2]

Depends on where your 3CX is installed. Did you read the requirements before?

 

[proitek]

Yes I did. And I understand the SBC part however the even the mobile apps (who are not working with SBC) won't works on the network.

 

[bitn2]

Than you have some networking problems you need to fix before.

 

[SweetAction]

I don't understanding something.

You are using the mobile apps (eliminate the IP phone for a second since the apps have a tunnel/sbc built in)
The server is HostedBy3CX
At some places everything works, but when connected to one specific network it's all broken?

Something on that network is blocking/breaking outbound port 5090 then (and maybe 5001/443). Those should be the only 2 ports needed for the mobile app to function correctly.

Start troubleshooting there.

 

[proitek]

Correct, when on the office network, mobile apps can received or make calls.

I'll check some of the rules in the firewall and confirmed with our team that the ports are correctly open.

Thank you for your help, I'll updated the ticket.

 

[proitek]

SBC solved all my issues thank you very much all for your help.