Searching phonetic by DoubleMetaphone soundex encoder

[Navaa]

Hi,
I am using solr for searching phoneticly equivalent string
my schema contains...
<fieldType name="text_general_doubleMetaphone" class="solr.TextField"
positionIncrementGap="100">
                <analyzer type="index">
                        <tokenizer class="solr.StandardTokenizerFactory" />
                        <filter class="solr.PhoneticFilterFactory" 
encoder="DoubleMetaphone"
inject="true"/>
                        <filter class="solr.LowerCaseFilterFactory"/> 
                </analyzer>
                <analyzer type="query">
                        <tokenizer class="solr.StandardTokenizerFactory" />
                        <filter class="solr.PhoneticFilterFactory" 
encoder="DoubleMetaphone"
inject="true"/>
                        <filter class="solr.LowerCaseFilterFactory"/> 
                </analyzer>
     </fieldType>

and fields are

<field name="fname" type="text_general" indexed="true" stored="true"
required="false" />
<field name="fname_sound" type="text_general_doubleMetaphone" indexed="true"
stored="true" required="false" />
   <copyField source="fname" dest="fname_sound" />


it works when i search stfn===> stephen, stephn 

But I am expecting stephn=====> stephen like 
How I will get this result. m I doing something wrong

Thanks in advance



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