【请求参数】：{"filter":{"is_to_all":true},"voice":{"media_id":"v4X9JmaDZop6m24XT-xv1OuaXPaNUuTn8mVcY7RsyDG2mOvfrIEcpfVb91eKSeoK"},"msgtype":"voice","send_ignore_reprint":0}

微信原始报文：{"errcode":268488001,"errmsg":"system busy, please try later rid: 64070218-2c48ae54-6a03391a"}，群发其他类型的消息就可以