voip for ns2.. you can add new traffic/VoIP

ns-2 VoIP仿真器补丁。 需要先下载ns-2.34,再用一下命令加补丁： cd /usr/local/ns-allinone-2.34/ns-2.34 cat /tmp/ns2VoIP++150310.patch | patch -Np1 -ns-2 VoIP emulator patch. Need to download the ns-2.34, and then click Add patch command: cd/usr/local/ns-allinone-2.3