I'm trying to write a Deluge function for sending document sign link via SMS

With my current deluge script, I can get the sing link delivered by email, no SMS

info zoho.currenttime.addHour(17);

deal = zoho.crm.getRecordById("Deals",id);

account = zoho.crm.getRecordById("Accounts",deal.get("Account_Name").get("id"));

contact = zoho.crm.getRecordById("Contacts",deal.get("Contact_Name").get("id"));

documentid = "9ovp116285db24942421486c5f3db4f382077";

url = "https://zohoapis.com/writer/api/v1/documents/" + documentid + "/merge/sign";

// change to data merge sign

fields = Map();

fields.put("Account_Name.Account_Name",account.get("Account_Name"));

fields.put("Account_Name.ACN",account.get("ACN"));

fields.put("Account_Name.Billing_Street",account.get("Billing_Street"));

fields.put("Account_Name.Billing_Street_2",account.get("Billing_Street_2"));

fields.put("Account_Name.Billing_City",account.get("Billing_City"));

fields.put("Account_Name.Billing_State",account.get("Billing_State"));

fields.put("Account_Name.Billing_Code",account.get("Billing_Code"));

fields.put("Account_Name.ABN",account.get("ABN"));

fields.put("Account_Name.Trading_Name",account.get("Trading_Name"));

fields.put("Account_Name.Trustee_Name",account.get("Trustee_Name"));

fields.put("Director_1_Name",deal.get("Director_1_Name"));

fields.put("Currency_Code",deal.get("Currency_Code"));

fields.put("Amount",deal.get("Amount"));

data = Map();

data.put("data",fields);

params = Map();

signerList = List();

signerObj1 = Map();

signerObj1.put("recipient_1","vit@lend.com.au");

signerObj1.put("action_type","sign");

signerObj1.put("recipient1_countrycode","+61");

signerObj1.put("recipient_phonenumber","123456789");

signerObj1.put("language","en");

signerList.add(signerObj1);

params.put("signer_data",signerList);

params.put("merge_data",data);

params.put("service_name","zohosign");

params.put("filename","Account Terms - " + deal.get("App_ID") + " - " + account.get("Account_Name"));

documentObj = invokeurl

[

];

info "documentObj :";

info documentObj;

There is no even an option like in UI "Email" or "Email+SMS", I don't know if that is even possible in the Deluge script. The documentation doesn't explain anything 

Please, advise.