Speaker verification over telephone channel using RASTA

Hello,

I am using the following code for speaker verification. I want to include RASTA ( http://labrosa.ee.columbia.edu/matlab/rastamat/) since my database is recorded over the telephone channel. Please can someone help me to integrate RASTA in the following:

clc
clear

data_path='E:\Speech Database\VoIp';
all_path=dir(data_path); % get names of all wave files
cd folder_path='E:\Speech Database\NewFolder1'; %change the work path to current folder

spk_num=length(all_path); % the number of speakers
for i=1:spk_num
    [Speaker_data,fs]=readwav(all_path(i).name); %read in samples
    len=length(Speaker_data); %sample length

      half_len=floor(len/2); %half length
      Speaker_train=Speaker_data(1:half_len);%half of data, for training
      Speaker_intest=Speaker_data(half_len+1:len);%other half, for testing

      feature_train=melcepst(Speaker_train,fs,'0d'); %extract features
      feature_intest=melcepst(Speaker_intest,fs,'0d');
      mix=Gmm_train(feature_train,32);   %train a speaker model 

      Pin(i) =GMM_post(feature_intest,mix); %inset test

      %%imposter
      for j=1:spk_num
          index=1;
          if j~=i %if it is a different speaker
              [Speaker_out,fs]=readwav(all_path(j).name);  %read in samples
              feature_outtest=melcepst(Speaker_out,fs,'0d'); %extract features

              Pout(i,index)=GMM_post(feature_outtest,mix);  %outset test
              index=index+1;
          end
      end
  end

Thank you for your help and support.