sql - ISNULL not replacing with NULL -

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i have following code - 

   select        br_csno [party_key],        'w' [phone_type_cd],        isnull( ltrim( rtrim( fac_telno ) ), '0' ) [phone_num],        null [update_dt],        getdate() [batch_dt]           base b

i following result -

enter image description here

it not replacing null. why? because of wrong placement or usage of ltrim(rtrim()) ?

edit

sorry limited knowledge of sql. want trim fac_telno , replace null if 0

i think wanted. sorry causing confusion! 

select        br_csno [party_key],        'w' [phone_type_cd],        nullif( ltrim( rtrim( fac_telno ) ), '0' ) [phone_num],        null [update_dt],        getdate() [batch_dt]           base b

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