'org.mobicents.ussd:slee:3.0.21'
<dependency>
<groupId>org.mobicents.ussd</groupId>
<artifactId>slee</artifactId>
<version>3.0.21</version>
</dependency>
<dependency org="org.mobicents.ussd" name="slee" rev="3.0.21"/>
"org.mobicents.ussd", "slee", "3.0.21"