These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.06 s (backtrack: 0/20).

[ebuild  N     ] media-sound/gsm-1.0.24-r1::gentoo  66 KiB
[ebuild  N     ] media-libs/libilbc-3.0.4:0/3::gentoo  1277 KiB
[ebuild  N     ] media-libs/speex-1.2.1-r2::gentoo  USE="vbr -utils -valgrind" CPU_FLAGS_X86="sse" 1019 KiB
[ebuild  N     ] net-voip/yate-6.2.0:0/6.2.0::gentoo  USE="gsm ilbc ilbc-webrtc isac-float speex ssl zlib -amrnb (-dahdi) -doc -isac-fixed -mysql -postgres -sctp -spandsp -tdmcard -wanpipe -wpcard -zaptel" CPU_FLAGS_X86="sse2" 5972 KiB

Total: 4 packages (4 new), Size of downloads: 8333 KiB