I am currently setup with Kamailio 5.1 on an AWS t2.micro as a SIP300 LCR solution with a http_query call to an external resource (c# .NetCore app for LRN dip and MySQL Route choices) to get the contacts string, tag it to the Contact header an send 300. 

Its been a while since I have performance tested on SIP and It was SIPp.
  1. Is http_query a bad choice for performance. Is KEMI better?
  2. Are there any better free apps than SIPp?
  3. Has anyone got cps stats for a SIP300 only Kamailio instance on AWS
  4. Is AWS a bad choice for prime time LCR. Any gory stories? 
KD