Solved Disable CSTA on 3CX

[ALEX@Proconsult]

Hi!
We have an 3CX hosted PBX with yealink telephones. Our CRM works with ESTOS. So we added a second identity on the SIP phones.
The communication between ESTOS and the telephones works only sometimes.
The problem is that the yealink telephone can only use CSTA for one identity. The support from ESTOS told us to disable CSTA on der 3CX PBX.
Is this possible?

Here the articel from ESTOS (translated with google)

uaCSTA problems with Yealink and 3CX​

Knowledge
March 2021

observation​

In the constellation 3CX PBX , Yealink devices (model-independent) and the uaCSTA , it happens that

• incoming and outgoing calls are not always signaled .
• Status information in the ProCall Client is displayed incorrectly or not at all
• the uaCSTA does not show a connection to the end devices or can only be connected sporadically.

Cause / explanation​

Yealink end devices can only process CSTA via an identity. Like the uaCSTA, the 3CX telephone system also uses the CSTA protocol. If CSTA is activated on the 3CX, problems with the processing of information occur on the Yealink device. This leads to the various types of error specified above.

solution​

Deactivate CSTA on the 3CX telephone system .
Please refer to the documentation for the 3CX telephone system to find out how to make these changes.

 

[Evolute IT]

You can remove the user-agent of the phone model in Settings > Parameters > CSTA_USER_AGENTS. They are separated by a comma. Remove the "Yealink Txx" for your model.

Note that this may render your install unsupported but I don't think changing the CSTA will break anything (beside CSTA.)

 

[ALEX@Proconsult]

Hi Frederik!
Thank you for your help. I have disabled CSTA.
Now we'll test one day and then we'll see if this is the solution for our problem.

 

[ALEX@Proconsult]

Hi!

Estos ProCall is now working fine with our hosted 3CX PBX!

Thank you very much.