No sound on deskphones

[xkoukos]

Hi, i have a problem on my system.
On deskphones and on a device that i have register direct on SIP i have no sound.
They hear me but i cant hear.
When i call on 999 i hear but whaen i call on *777 i cant hear anything.
The problem is on internal and external calls. Incoming and outgoing....

On iPhone App everything is ok.
I havent change anything the last days.
SIP ALG is off from the first time.

 

[SweetAction]

How is the devices connected? STUN or SBC?

 

[xkoukos]

It’s stun.
Provisioning via lan.

 

[PanagiotisL_3CX]

It’s stun.
Provisioning via lan.

These are two different provisioning methods. Are the phones and the PBX in the same LAN, or is the PBX in the cloud?

 

[xkoukos]

Sorry. It is in the same lan

 

[PanagiotisL_3CX]

@xkoukos

Which IP phones are used - brands, models and firmware versions?

 

[xkoukos]

Yeahlink T21p E2
Latest firmware
But the problem starts at the same time and at an old SPA112
all at the same lan, register via local ip

 

[PanagiotisL_3CX]

Would be best if you also run a capture on the PBX and one of the phones to check the RTP packets. If they do not reach the phone this should be checked in the local network.

 

[xkoukos]

On iOS app everything is ok on all phones

 

[PanagiotisL_3CX]

Sure, but the iOS app uses the 3CX tunnel for RTP. The IP phones and PBX contact each other locally. There should be no issue with the PBX transmitting RTP to the phones which is why a packet capture will probably indicate where the issue is.