Solved Yealink T46S new phone with 3CX, no audio to/from the other extension

[George Ku]

I have 3CX V15.5on my server for about 3 years.
Phones were CISCO SPA. All phones are in the same internal network with 3CX server.

Since SPA phones are old, we decide to switch to YEALINK T46S.

When I switch first T46S phone and configure provisioning(3CX already configure to use T46S template), everything are fine.
T46S register to 3CX by UDP.

Then I make a call to old SPA. No audio!! Both phone can not hear anything.

I try another T46S, the same!

What mistake did I have?

George

 

[eddv123]

Commonly audio issues are related to Firewalls blocking the RTP/Media ports, in your case this should not be relevant as all the phones are in the local network (and I assume you are making local calls).

Please check:

* Firmware on the phones themselves.

* The end-points are not sitting in their own separate VLAN's and would thus require inter-routing to be setup.

* Trace a call from the Yealink and look at the PCAP, this can be done easily with the below:

1. Set the syslog level to 6 -> reboot phone
2. Start to capture the Trace -> reproduce your issue -> stop capturing the Trace -> Export PCAP Trace.
3. Export config.bin
4. Export level 6 syslog -> check the syslog level

I would also suggest Windows firewall if your 3CX server is running on Windows however for local calls the media will be passed end-point to end-point (not via the PBX) anyway.

 

[Saqqara]

Are you running the latest service pack for 15.5 which is SP5

 

[George Ku]

Currently 15.5.10244.4

Are you running the latest service pack for 15.5 which is SP5

 

[YiannisH_3CX]

Is the issue only between Yealink and Cisco phones? What happens if you call another Yealink device? What happens if you call a Cisco device from a 3CX client?
How are the phones provisioned? Are they local to the PBX or remote?

 

[George Ku]

Solved. TKX everyone.

 

[YiannisH_3CX]

Glad to see the issue has been resolved