I was not able toc create any XPath filter on the above XML. I took only the below and able to create XPath Filter using substring on "+00542798134".
<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Header />
<soap:Body>
<existingAccountDuration>0000</existingAccountDuration>
<cidPersID>+00542798134</cidPersID>
<hasExistingCreditCard>false</hasExistingCreditCard>
<isRegistrationSelected>false</isRegistrationSelected>
<customerSegment>3</customerSegment>
<customerNumber>30135413406907</customerNumber>
<otherBankDuration>0000</otherBankDuration>
<cbsCustomerNumber>30135413406907</cbsCustomerNumber>
<newCustomerIndicator>true</newCustomerIndicator>
<isAuthCustomer>false</isAuthCustomer>
</soap:Body>
</soap:Envelope>
I used the XPath "substring(string(/soap:Envelope/soap:Body/cidPersID),2)" to get the value as "00542798134"