Testing the latest git has introduced an issue but I wonder if I can get around it by combining the snippet below into one bridge command. If I can set the ringback in the bridge it may fix it. I did not see this in the wiki. Can it be done?
Mario G

        <action application="bridge" data="[originate_timeout=17]group/home@${domain_name}"/>
<action application="set" data="ringback=${us-ring}"/>
<action application="bridge" data="[originate_timeout=1]group/MGT@${domain_name}"/>