[Serusers] only receive trying,but no ring

hi I now work to make a call,receive the tring packet but now ring later,the packet is below,pls help. Received from udp:10.110.11.9:5060 at 17/10/2005 16:46:47:875 (555 bytes): SIP/2.0 100 trying -- your call is important to us Via: SIP/2.0/UDP 10.110.10.149:1357;branch=z9hG4bK-rkad5409p17a;rport=1357 From: "test1" <sip:1234@10.110.11.9>;tag=b820xr0tze To: <sip:5678@10.110.11.9;user=phoneCall-ID: f56453439fd5-qaod8sww6dpi@snomSoft CSeq: 1 INVITE Server: Sip EXpress router (0.8.12 (i386/linux)) Content-Length: 0 Warning: 392 10.110.11.9:5060 "Noisy feedback tells: pid=24182 req_src_ip=10.110.10.149 req_src_port=1357 in_uri=sip:5678@10.110.11.9;user=phone out_uri=sip:5678@0.0.0.0:1511;line=3tjczupg via_cnt==1" 　　　　　　　　fishman7788 　　　　　　　　fishman7788(a)163.com 　　　　　　　　　　2005-10-17