Issue Description
Grandstream UCM returns status code -8 for certain actions such as getSystemStatus, addoutboundroute, listvoiptrunk etc. Response code -8 indicates system timeout. Let's take a look at the UCM's Syslog to find out more.
Analysis from UCM's Syslog
In the working scenario, the Syslog shows 200 OK with the data populated.
In the non-working scenario, the Syslog shows that the CTI request was called with an invalid cookies.
Quick fix
Go to Postman application and delete the Cookies setting. Run the requests and verify if it works. This will be addressed in the future releases.
If the method above does not work, please submit a ticket with the Grandstream Support team.
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