可能是拨号计划的问题，请参考：

#Ruby

# SIP tracing : true or false
sys.Trace = false

sys.Log("call from #{req.Header.From.FromURI.ToString()} to #{req.URI.User}.")

if sys.In then
# Do your INCOMING call processing customisations here.
if sys.IsAvailable() then
sys.Dial("#{sys.Username}@local",30)
sys.Dial("Enter Number@mysip",30)
sys.Respond(480, "#{sys.Username} Not available")
else
sys.Dial("Enter Number@mysip",30)
sys.Respond(480, "#{sys.Username} Not available")
end

else
# Do your OUTGOING call processing customisations here.
sys.Dial("mysip")

end