谢谢大虾，我照抄了你的dialplan，回拨是工作了，可是有个问题，

初始拨sipgate号码时老是被提示“you've reached an nonworking number”,而没有直接给一个挂机信号，必须手动挂机。与此同时回拨倒是正常工作，不过好像没有等15秒。现在的dialplan是：（完全是照抄的，就是从16行起不知道那些代码起什么作用)

sys.Trace = false

cid = req.Header.From.FromURI.User

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

# callback processing

case cid

#when /^01186/ then

when /^415/ then

cid = cid.to_str[3,20]

case cid

#when /^8613826221111/ then

when /^508/ then

#sys.Callback("0018177292222@CC","00#{cid}@RG",15)

sys.Callback("#{req.URI.User}@local","001415#{cid}@VD",15)

sys.Respond(480, "#{req.URI.User} Not available")

else

#sys.Callback("#{req.URI.User}@local","00#{cid}@VD",15)

sys.Callback("#{req.URI.User}@local","001415#{cid}@VD",15)

sys.Respond(480, "#{req.URI.User} Not available")

end

else

if sys.IsAvailable("#{req.URI.User}","sipsorcery.com") then

#sys.Dial("#{req.URI.User}@local",30)

sys.Dial("Enter Number@VD",30)

sys.Respond(480, "#{req.URI.User} Not available")

else

#sys.Dial("Enter Number@VD",30)

sys.Respond(480, "#{req.URI.User} Not available")

end

end