[Serusers] WINFO

Hi. If I send a Subscribe with event=presence.winfo, SER answers with "Unsupported document format". In my config file, I have the line "watcherinfo_notify", 1. Where is the problem? I can't find an error in my Subscribe message. Regards, Alois SUBSCRIBE sip:pda_user@fh-joanneum.at SIP/2.0..Via: SIP/2.0/UDP 10.0.0.3:5060;branch=z9hG4bK7288678..Max-Forwards: 70..From: &lt;pda_user(a)fh-joanneum.at&gt; ;tag=1085963678..To: <pda_user@fh-joanneum.at>..Call-ID: 1239455995-305180140- 863656382..CSeq: 2 SUBSCRIBE..Contact: <pda_user@10.0.0.3>..Content-Leng th: 0..Accept: application/pidf+xml..Allow-Events: application/watcherinfo+xml..Expires: 3600..Event: presence.winfo..User-Agent: ... SIP/2.0 415 Unsupported document format for given package..Via: SIP/2.0/UDP 10.0.0.3:5060;branch=z9hG4bK7288678..From: &lt;pda_user(a)fh-joanneum.at&gt;;tag=1 085963678..To: &lt;pda_user(a)fh-joanneum.at&gt;;tag=589230a54cd08b3768529724501fae28- c331..Call-ID: 1239455995-305180140-863656382..CSeq: 2 SUBSCRIBE..Server : Sip EXpress router (0.10.99-dev35-pa-4.1 (i386/linux))..Content-Length: 0..Warning: 392 10.0.0.11:5060 "Noisy feedback tells: pid=10832 req_src_ip= 10.0.0.3 req_src_port=5060 in_uri=sip:pda_user@fh-joanneum.at out_uri=sip:pda_user@fhjoanneum. at via_cnt==1".