i still have not found the answer to this problem but was also having trouble connecting from phones outside localhost in case this is of help to others mobicents by default can only be connected to by localhost to make it see all available ips you must specify -b 0.0.0.0 after launching bash file so instead of
sudo path/to/file/mss-3.0.0-SNAPSHOT-jboss-as-7.2.0.Final/bin/standalone.sh -c standalone-sip.xml
it should be
sudo path/to/file//mss-3.0.0-SNAPSHOT-jboss-as-7.2.0.Final/bin/standalone.sh -c standalone-sip.xml -b 0.0.0.0