The activemq.xml file has entries for <transportConnectors> followed by multiple <transportConnect.. elements. Each entry defines a protocol and port that the broker listens on.
<transportConnector name="openwire" uri="tcp://localhost:61616"/>
<!-- Brokers we know about -->
<f:endpoints>
<f:broker
name="GENERALSERVICES"
url="tcp://127.0.0.1:61616?wireFormat.tcpNoDelayEnabled=true"
username=""
password="" />
<f:broker
name="DCSERVICES"
url="tcp://127.0.0.1:61616?wireFormat.tcpNoDelayEnabled=true"
username=""
password="" />
<f:broker
name="RMSERVICES"
url="tcp://127.0.0.1:61616?wireFormat.tcpNoDelayEnabled=true"
username=""
password="" />
</f:endpoints>