[syslog-ng] Send GELF log messages to Syslog-NG server

Hi people, a Graylog server is sending GELF log messages to my Syslog-NG server listening on the UDP/514 port. But when I was reading the message, I noticed it's in binary format. Maybe syslog-ng service converts GELF to binary, because the log is not in syslog format. Is it possible to make Syslog-NG listen on the UDP/12201 port for incoming GELF messages, in addition to UDP/514 syslog port ? Or what can I do to accept GELF messages in the Syslog-NG server and then read them in ASCII format ? Thanks a lot!