[Serusers] bad udp packet? why!

[jiangjp]

I installed the ser in Redhat 9.0. I use ngrep to capture the
packet.Sometime I got the bad UDP packet send from ser. The following is an
example(210.192.101.193 is the ser installed), before MESSAGE sip there are
illeagal chars (maybe due to the udp size limit?):

 U 210.192.101.193:80 -> 218.25.90.134:31500 19036 at 0:1480
  .P{.....MESSAGE sip:lumy1314 at 218.25.90.134:31500 SIP/2.0..Call-ID: 0f9
  ffc6b4dbc35dd8cf153975330c83e at 210.192.101.20..CSeq: 1 MESSAGE..From: "
  miphone" <sip:multichat at sip.miphone.cn:20000;transport=udp>;tag=160203
  74..To: <sip:lumy1314 at dododoo.com>..Via: SIP/2.0/UDP 210.192.101.193:8
  0;branch=z9hG4bKacb8.7ed584b7.0..Via: SIP/2.0/UDP 210.192.101.20:20000
  ;branch=z9hG4bK42e5063b387e084e01f8119c4491d60e..Max-Forwards: 69..Con
  tent-Type: text/x-miphone-multichat..Content-Length: 995..P-hint: usrl
  oc applied....<?xml version="1.0" encoding="UTF-8"?>.<miphone>.<comman
  d type="add user">.<from>sip:server</from>.<to>lumy1314 at dododoo.com</t
  o>.<commandcontent>.<roomid>38563504</roomid>.<sipaddr>hxl at email.com.c
  n</sipaddr>.<name>tuhxl-1</name>.<sex>...</sex>.<age>4</age>.<imageid>
  99999</imageid><location></location>.<userauthority>2</userauthority>.
  <userspeakstatus>NO</userspeakstatus>.<uservideostatus>NO</uservideost
  atus>.<audioaddr>61.149.14.202</audioaddr>.<audioport>28904</audioport
  >.<videoaddr>61.149.14.202</videoaddr>.<videoport>28914</videoport>.<n
  attype>1</nattype>.<firewalladdr></firewalladdr>.<localvideoaddr>61.14
  9.14.202</localvideoaddr>.<localvideoport>28914</localvideoport>.<loca
  laudioaddr>61.149.14.202</localaudioaddr>.<localaudioport>28904</local
  audioport>.<nowuserlist>.<user>hxl at email.com.cn</user>.<user>tuhxl at mip
  hone.com.tv</user>.<user>bug at miphone.com.tv</user>.<user>lumy1314 at dodo
  doo.com</user>.<user>czl at dododoo.com</user>.</nowuserlist>.</commandco
  ntent>.</c