When you receive an incoming call, you can set up your Call Flow such that you can send a dynamic reply to the caller.

To do this, use the 'SMS' applet in your incoming Call app (aka flow). In the text box, you can enter a URL (instead of static text). When there is a URL, Exotel will make an HTTP GET request to this URL. The URL can return text to send as an SMS reply.

Note: In case you are using a prebuilt app like the MissCall app or the Oak tree App, you can just enter your URL in the SMS textbox provided

Before the GET request, Exotel will make an HTTP HEAD request to make sure that the URL is indeed returning the correct 'ContentType' as mandated below. 

The GET request that Exotel makes to the URL will have the following query parameters:

CallSidstring, unique identifier of the call
Fromstring, the number of the caller
Tostring, your Exotel company number to which the call came
digitsstring, If there was a Gather or a Menu applet before this SMS applet, this is the DTMF input that was gathered 

If you want to send an SMS reply to the caller, the HTTP response MUST
- the HTTP response must have 'ContentType' header set to 'text/plain'. 

- the HTTP body must have the reply to send

For example, if you've configured http://example.com/exotel.php
we will make an HTTP GET request to

Sample php script which sends dynamic reply

header('Content-type: text/plain');
$dynamicReply = "Hello";
// Insert your logic here to use $_REQUEST to construct the dynamic response
echo $dynamicReply;

If you want to send a static SMS, you can select the DLT approved Template Choose a SMS Template and add the same to the text box. The prerequisite is to have an approved header/sender ID as well and the same must be added against the ExoPhone number assigned in the incoming call flow. How to assign sender ID, please find here: Header (Sender ID) Registration

Support Contact details: 



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