Yealink T19P E2 showing "No Service"

[brivera]

Hello,

I am experiencing an issue with a Yealink T19P E2 phone that is not registering with our 3CX PBX hosted on Google Cloud Platform (GCP).

Here is what I have done so far:

1. I followed the steps in this guide: 3CX SBC Installation
   • I installed the 3CX SBC on a local Windows 10 machine with a static IP address.
   • The SBC is up and running on 3CX
2. I then followed this guide: Provisioning IP Phones
   • Chose my SBC
   • The phone has been properly configured and rebooted.

Issue:

• After rebooting, the phone displays "No Service."
• When accessing the phone’s web interface, all configuration details appear correct.
• The phone can successfully ping the machine running the SBC.

Remarks:

• The phone and the SBC local machine are on the same network
• They both ping each other

Could you help me troubleshoot this issue?

Thank you.

 

[SteveITS]

Did you follow https://www.3cx.com/sip-phones/t19p-t21p-t23g-t27g/ ? Since it's "Supported (with limitations)" it has extra steps.

 

[brivera]

Yes I did but it still doesn't work:

 

[SteveITS]

53.84.0.140 firmware?
https://www.3cx.com/docs/phone-firmwares/

 

[brivera]

53.84.0.140 firmware?
https://www.3cx.com/docs/phone-firmwares/

Yes

 

[JohnS_3CX]

1. Disable "Line Active" and "Confirm

2. Start pcap on phone (Settings > Configuration) then go back and enable "Line Active" again so it will try to reconnect

3. After about 30 sec or so go back and stop the pcap

Open the pcap file in wireshark, or show the file to your 3CX Partner and you should see what happens when the phone tries to register.


If you see the phone sending REGISTER to your Windows 10 SBC IP address and never getting any replies back, check the Win 10 firewall or any possible network issues that prevent the phone reaching the SBC.