probably, no one can provide you this information, as it heavily depends on your setup and the network configuration, your targeted setup and your targeted customers.

If you run Kamailio for Telemarketing services, you could expect a lower ASR, than for regular residential services. We have a NER of 100% in all of our setups (residential, VoLTE, WebRTC, Class4), but what does this number tell you? Probably, that we scale our solutions according to the requirements or that we currently have fewer customers on WebRTC than on VoLTE or fixed? ;-) Likely, if you run WebRTC, you'll have a lower number of online users and concurrent calls than for a classic residential service, as you'll have to do TLS and SRTP and not simple UDP and pass-through RTP. If you provide a WebRTC to WebRTC service, the numbers are different, than if you provide a WebRTC breakout service....

Some references:

- 1&1 is running Kamailio for 2,5 Mio (??) subscribers.

- we've been running Kamailio for 1,3 Mio residential subscribers on two Hardware boxes (common Dell Servers) some 10 years ago, running up to 60k concurrent calls. We've been able to do this on only two servers, as we did not have to take care about Media-Relaying. That setup had an NER of 100% and an ASR between 50% and 80%, the ASR was higher during the evenings, as people were at home.

Thanks,

Carsten