Kamailio dispather 选中目标节点后获取目标属性

attrs字段样式：

duid=10.245.1.1:5060;type=cc
duid=10.245.1.2:5061;type=sbc
duid=10.245.1.2:5062;type=vos

如需获取attrs字段属性：

... modparam("dispatcher","xavp_dst","$var(_dsdst_)" ... route[DETECT_NETWORK_SRC] { if (!ds_select_dst("1","10")) { ... } $var(network_type) = $(xavp(_dsdst_=>attrs){param.value,type}); if ($var(network_type) == "CC") { //转发到CC侧 ... } else if ($var(network_type) == "sbc") {//转发到sbc侧 ... } else if ($var(network_type) == "vos") {//转达到vos侧 ... } else {//转发目标未分类 ... } }

xavp_dst(str)参数说明：

The name of the XAVP which will hold the list with addresses and associated properties, in the order they have been selected by the chosen algorithm. If use_default is 1, the values of last XAVP correspond to the last address in destination set. In case of using dispatcher.list file, you have to set the priority field for each destination to ensure a particular order there. The first XAVP is the current selected destination. All the other addresses from the destination set will be added in the XAVP list to be able to implement serial forking.

Note

You must set this parameter if you want to do load balancing fail over.

Default value is “_dsdst_”.

xavp_dst_mode(int)参数说明：

Control what fields are added to the XAVP specified by xavp_dst parameter.

The addeded fields are:

• grp - the set id (group id).

• uri - the URI address.

• sock - the socket pointer.

• socket - the socket string - it is added only if xavp_dst_mode has bit 2 set (value 2).

• sockname - the sockname string - it is added only if xavp_dst_mode has bit 3 set (value 3).

• dstid - the destination unique id (in case of call load distribution algorithm).

• attrs - the attributes - they are added if xavp_dst_mode does not have the bit 1 set (value 1).

Default value is “0” (add all fields).

ds_select_dst(set, alg[, limit])方法说明：

The method selects a destination from addresses set. It returns true if a new destination is set. The selected address is set to dst_uri field (aka the outbound proxy address or the $du variable), not being visible in the SIP request.

If the bit 2 in 'flags' parameter is set, the rest of the addresses from the destination set are stored in XAVP list (limited with an optional 'limit' parameter). You can use 'ds_next_dst()' to use next address in order to achieve serial forking to all possible destinations.

Meaning of the parameters is as follows:

• set- the id of the set from where to pick up destination address. It is the first column in destination list file. The parameter can be an integer or a variable holding an integer.

• alg- the algorithm used to select the destination address. The parameter can be an integer or a variable holding an integer.

• limit- the maximum number of items to be stored in XAVP list for further fail-overs (the first selected destination and default destination are the first to be put in the list). This can improve the performance especially if you are using a large list of gateways.

EG：

... ds_select_dst("1", "0"); ... $var(a) = 4; ds_select_dst("1", "$var(a)"); ... ds_select_dst("1", "4", "3"); ...