[Serusers] click2dial issue

Hi all, i am trying to use click 2 dial in phonebook (serweb). But unfortunately i am not able to get this to work. I always get the following error in the popup window: 407 Proxy Authentication Required The sip trace gives the following ( i have sniffed eth0 and lo) on the eth0 (with public ip@ the dns query and response) No. Time Source Destination Protocol Info 16 3.618415 89.xxx.xxx.218 89.xxx.xxx.129 DNS Standard query SRV _sip._udp.yyyy.zzz No. Time Source Destination Protocol Info 17 3.618868 89.xxx.xxx.129 89.xxx.xxx.218 DNS Standard query response SRV 200 0 5060 proxy.yyyy.zzz on my loopback interface No. Time Source Destination Protocol Info 1 0.000000 89.xxx.xxx.218 89.xxx.xxx.218 SIP/SDP Request: INVITE sip:firstname.lastname@yyyy.zzz, with session description No. Time Source Destination Protocol Info 2 0.000251 89.xxx.xxx.218 89.xxx.xxx.218 SIP Status: 407 Proxy Authentication Required No. Time Source Destination Protocol Info 3 0.000332 89.xxx.xxx.218 89.xxx.xxx.218 SIP Request: ACK sip:firstname.lastname@yyyy.zzz i can see several INVITE-407-ACK but no INVITE with proxy-authorization from controller(a)yyyy.zzz have i forgotten to configure something. thx in advance