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part. The SIP FROM header’s URL will be the
SIP_User_ID@Domain or SIP_User_ID@SIP_Proxy_Server.
Keep Alive: Enable or Disable it.
Keep Alive Time (sec): Specify of times send sip register message to
proxy server.
Note: please don’t delete sip trunk, even it is unless at all, because it have to
be used with Route plan.