Does the benchmark make use of DNS/SRV or does it work with IPs alone?
The benchmark does make use of user name resolution (mapping URIs to IP addresses). All users are registered to the same domain, sip.spec.org, and the SUT must map a user URI to the appropriate IP address. The benchmark does not perform any DNS resolution. While DNS resolution can have a significant impact on performance (e.g., if the server blocks while waiting for a resolve), modeling DNS resolution is complex and would require making estimates of DNS cache miss ratios and costs to retrieve DNS records over the network. Thus DNS resolution is outside the scope of the benchmark, at least for the first release.
