The best replacement for opensips is kamailio.

The best alternatives to opensips are rated as following:
★★★★★  kamailio
★★★  asterisk
★★★  freeswitch
★  sipxecs
  openser

Your alternative for opensips is not listed? Suggest!
Speaking about opensips, one probably shouldn't forget about freeswitch.

Other search terms related to opensips and their ratings are:
★★★★★ freeswitch
★★★★ a2billing
You have in mind a companion for opensips and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of opensips in all years. Click on graph for more.
opensips
kamailio
asterisk