[Serusers] Weirdness trying to send IM

I'm attempting to send an IM via SIP using the method described in the admin guide (from the command line). When I try, I get these messages in the logs: Dec 15 10:10:26 death /usr/local/sbin/ser[8138]: ERROR: fifo_server: command must begin with :: NOTIFY Dec 15 10:10:26 death /usr/local/sbin/ser[8138]: ERROR: fifo_server: command must have at least 3 chars Dec 15 10:10:26 death /usr/local/sbin/ser[8138]: ERROR: fifo_server: command must begin with :: To: sip:1234@my.server.com Dec 15 10:10:26 death /usr/local/sbin/ser[8138]: ERROR: fifo_server: command must begin with :: Hello world!!!! Can someone tell me what crucial step I'm missing here? N.