Select Distinct Values

I have a problem when selecting distinct values from a table. I want to select those distinct numbers with a code that I want. To make it more clear i`ll show it on an example.I have the following table:

tel_no | code | id_res
+-----------+--------------+-----------
0742062141 | a-not answer | 1
0742062141 | a-not answer | 2
0742062141 | c-answer | 3
0754231456 | a-not answer | 4
0754231456 | a-not answer | 5

When I use the following query it returns the distinct number but with the first code it finds:

select a.* from test_funnel as a
inner join
( select distinct tel_no,MIN(id_res) as id_res
from test_funnel

[code]....