Hello, it is usally pretty hard to give a generic answer to this kind of questions, as you can also see in the lack of other replies. It all depends on the exact configuration, dependencies, user agents, PBX, trunks etc.. 128GB RAM is much more than you usually need, Kamailio is normally happy with a few GB even for a really large setup. For 20k concurrent calls you probably want to have multiple instances, just for maintenance and to not have a single point of failure. I would just go for virtual hardware, which is obviously much easier to upgrade. Then start with a common setup that you use also in other installations and do benchmark. If you encounter a bottle-neck, optimize the necessary parts, increase the resources or scale out. Cheers, Henning -- Henning Westerholt – https://skalatan.de/blog/ Kamailio services – https://gilawa.com<https://gilawa.com/> From: sr-users &lt;sr-users-bounces(a)lists.kamailio.org&gt; On Behalf Of Muborakshohi Masoud Sent: Tuesday, April 12, 2022 3:07 PM To: sr-users(a)lists.kamailio.org Subject: [SR-Users] High performance Hello! I have kamailio 5.5 configured with digest authentication. DB Mysql, 2 rtpengine one on the same server with kamailio, the other is separate. Rtpengins work in bridge mode, internal/external/external-ipV6. Kamailio listen 3 address: internal/external/external-ipV6 work in mixed mode: ipV4-ipV4, ipV4-ipV6, ipV6-ipV6. OS Debian 10, CPU 1 core, Ram 4gb, Disk not ssd. internal address is used for the gateway model of the connection to the PSTN. Before sending a call to PSTN, a request is sent to Billing by Diameter (request over the network, ims_charging ), Billing responds in the region of 10-17 milliseconds. usrloc db_mode = 0; UAS contacts are received according to the PUSH scheme (we send PUSH via http and get a REGISTER). children = 8 for each; When running synthetic tests with sipp, I get 36 cps as a maximum, but there are a lot of retrans. This is a test environment. Product: I plan to get 100 cps; 20k concurrent calls, hardware will be 128GB RAM ddr4-2400; Intel Xeon Silver 4216, Optane SSD. 2 such servers, kamailio/rtpengine are configured exactly according to the scheme of the test environment. Question: Can you please tell me how many children, shm/pv do I need? Is it worth going in the direction of asynchrony, or is the standard one enough for my purpose? I will be very glad for any help. Thank you! -- Отправлено из Mail.ru для Android