code: public OvhPhonebookMaster billingAccount_phonebook_bookKey_GET(String billingAccount, String bookKey) throws IOException {
  		String qPath = "/telephony/{billingAccount}/phonebook/{bookKey}";
  		StringBuilder sb = path(qPath, billingAccount, bookKey);
  		String resp = exec(qPath, "GET", sb.toString(), null);
  		return convertTo(resp, OvhPhonebookMaster.class);
  	}
docs: Get this object properties
  
  REST: GET /telephony/{billingAccount}/phonebook/{bookKey}
  @param billingAccount [required] The name of your billingAccount
  @param bookKey [required] Identifier of the phonebook