Let’s hope that limb can support us both. I’ve already gone out there.
I can assure You this is not the case. They are not rejecting me because of asterisk. I can also register it via yeastar S20 PBX which is also asterisk based but settings are far away easier.
I have managed to make it register via CHAN_SIP and I can have incoming calls but there is no audio at all in both directions. Also, I am not able to place calls . I always hear a message “All circuits are busy now”. This is only bad configuration problem. TCPDUMP gives no any error now. Here is my current configuration: