There is only one thread that reads from port 5060. For most people, the performance limit is set by media processing, not by signalling, and even for signalling, it is set by dialplan processing, not the basic UAS handling. 540,000 BHCA is a huge load. I have a feeling it is about an order of magnitude bigger than a main network switch.
Thanks for the reply. It makes sense. I’ll do the other tests (with media and RTP) and compare it with other cores. Maybe this time, it will use the other cores.