I have question regarding of call forking on kamailio. Maybe somebody can help me.
For example I have table like

 

+--------------+---------------+--------------+---------------+--------------+
| First number | Second number | Third number | Fourth number | Fifth number |
+--------------+---------------+--------------+---------------+--------------+
|   A number   |   B number    |   C number   |       ---     |      ---     |
+--------------+---------------+--------------+---------------+--------------+
Table 1: Extra_numbers

 

or

 

separated by comma

 

+--------------------+-----------------------------+
| First_number       |     Additional_numbers      |
+--------------------+-----------------------------+
|   Primary number   |     2nd,3rd number          |
+--------------+-----------------------------------+
Table 2: Extra_numbers

+--------------------+---------------------------------+
| First_number       |     Additional_numbers          |
+--------------------+---------------------------------+
|   Primary number   |  2nd number,3rd number,4 number |
+--------------------+---------------------------------+
Table 3: Extra_numbers

 

If kamailio get the call (INVITE) to some number/extension (for example, "1st number"), then in routing I request (select `Additional_numbers` from `Extra_numbers` where First_number='1 number';) from the mysql database and there I check, if "Additional_numbers" exists in the database.
Then I add "Additional_numbers" to the routing, and generate INVITE to "Additional_numbers" and 1 number. (always)

set r-uri ($ru) to first destination (2 number)

set r-uri ($ru) to second destination (3 number)

set r-uri ($ru) to Third destination (1 number)

set r-uri ($ru) to n destination

How could this be done?

 

Who can help with routing?