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在openser系列中，如果用dispatcher模块，总会看到类似以下这样的调用方式：
ds_select_dst("1", "5");
第一个参数是网关组，第二个怎么选择呢？
“0” - hash over callid
“1” - hash over from uri.
“2” - hash over to uri.
“3” - hash over request-uri.
“4” - round-robin (next destination).
“5” - hash over authorization-username
“6” - random (using rand()).
“7” - hash over the content of PVs string.
“X” - if the algorithm is not implemented, the first entry in set is chosen.