We purchased the Endpoint Manager module to be able to configure Grandstream phones. We have successfully configured one as a test. However, it doesn’t matter if placing an internal or external number, the call takes 18-20 seconds to complete. Every time. All settings seem good. I don’t know what it could be.
So, as a test, we configured two more Sangoma phones using EPM and we are having the same issue!
Can someone please shed some light into this?
We are running FreePBX15 with all the latest updates installed.