[Serusers] SIP registration failed, status=408 (Request Timeout)

[朗雀通信服务有限公司]

hi:
  
  I installed ser-0.9.6 on centos 5.
  I start ser use ser -D -E.
ser -D -E
Listening on 
             udp: 127.0.0.1 [127.0.0.1]:5060
             udp: 121.14.136.107 [121.14.136.107]:5060
             tcp: 127.0.0.1 [127.0.0.1]:5060
             tcp: 121.14.136.107 [121.14.136.107]:5060
Aliases: 
             tcp: localhost:5060
             tcp: localhost.localdomain:5060
             udp: localhost:5060
             udp: localhost.localdomain:5060

  When i registered with sip ua but the "SIP registration failed, status=408 (Request Timeout)" return.

  The annex is the ser.cfg file and tested result with sipsak.  
  
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