The best replacement for mgcp is sip.

The best alternatives to mgcp are rated as following:
★★★★★  sip
★★★  h 323
★★  megaco
★  sccp
★  h323
★  h.248
★  h 248
  h.323

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

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



Google Trends

Scale is based on the average worldwide traffic of mgcp in all years. Click on graph for more.
mgcp
sip
h 323