Short video:

You can choose to configure the Connect applet parameters using the flow builder itself or control it dynamically through a URL. However, you will need to configure the transitions (next applet) while building the flow irrespective.

If you choose to configure the parameters dynamically using your application URL, you can set a ‘Primary URL’ for handling the requests. You can also set a ‘Fallback URL’ (optional) which will be contacted in case something goes wrong with your ‘Primary URL’. 


If an application URL is set for Connect applet, Exotel will make a GET request to the URL with the call details as URL-encoded HTTP query parameters.

The following are the parameters of the GET request. Note that only some of this list may be passed to your application - depending on what stage of the flow you have placed the Connect applet.



This value will indicate the version of connect applet parameters against which your endpoint’s response will be validated.

Current Version: 1.0

Query Parameters:

Parameter Name



Unique identifier of the call


In case of an outgoing call, it’ll be set to the number from which the call is made. In case of an incoming call, it’ll be set to the number from which the call is received


In case of an outgoing call, it’ll be set to the number being dialed out. In case of an incoming call, it’ll be set to the number where the call landed.


The direction of the call. Possible values: ‘incoming’ or ‘outbound-dial’


Timestamp when the call is created (format : yyyy-mm-dd hh:mm:ss)


Value in seconds from the time call is triggered to the second leg of the call till it is over (including conversation time). This value can be set to zero depending on the previous applet and if there’s no second leg in the call flow.


Timestamp when the call is started (format : yyyy-mm-dd hh:mm:ss)


1970-01-01 05:30:00 // Unix time (also known as POSIX time or epoch time)

Note that this would be a constant value and you may instead trigger our Call details API a few minutes after the call has been completed, to get the accurate information




IVR only, no connect applet


Call conversation happened


The client hung up during connect applet


Connect applet, no agent picked up


Went to voicemail applet



Shows the number of the agent who was dialed to last


Flow id associated with the call


In case of an incoming call, it is the number of the caller. In case of an outgoing call, it is the number of the first leg of the call.


 In case of an incoming call, it is the ExoPhone into which the call came. In case of an outgoing call, it is the number to which the call was made.


Current server time (format : yyyy-mm-dd hh:mm:ss)

*These parameters will be passed if certain conditions are met as described below:

Parameter Name                


This will denote what happened with the second leg of the call if the previous applet was “connect”.

Possible values: 'completed', 'busy', 'no-answer', 'failed', 'canceled'


‘digits’ will be passed if there was a 'Gather' or ‘IVR’ applet before this applet and will be equal to the input digits that were entered. NOTE: This parameter comes with a double quote (") before and after the number. You'll have to trim() this parameter for double quotes (") to get the actual digits.


If the call was initiated via API, the value that was passed in CustomField in the API call will be set here.

This will be populated if the previous applet was "voicemail". It will contain the URL of the voicemail recording. There could be a delay before the recording can be accessed depending on the length of the recording file.


This is the response Exotel will expect to the GET request from your Connect Application URL. The response will decide what parameters will be set while executing Connect during the call flow.

Response Header:




"destination": {
"record": true,
"music_on_hold": {
"start_call_playback": {
"value":"This text would be spoken out to the callee"






default = false

This parameter will indicate if, after each unsuccessful dial attempt within connect, the parameters should be fetched again including destination numbers.

`false` will indicate, dial attempt to happen based on the initial response. No subsequent hits to the URL.

`true` will indicate if connect parameters including a number to dial should be fetched again (hit the configured URL again) if the dial attempt is unsuccessful.

NOTE: If 2 subsequent fetch results contain exactly the same set of destination numbers, Exotel will not make any subsequent attempts even if fetch_after_attempt is set to true.

GET /<customer-url>

Apart from standard request params, it’ll include <connect> params from the previous dial attempts.

<Same as above>



Indicates the destination(s) to dial out.


An array of numbers to be dialed out in E.164 format.

The dial will happen in the order they appear in the array.


“destination”: { 

  “numbers”: [“+622131921111”, “+622131921112”]



default = Incoming ExoPhone

ExoPhone to be used for dialing out in E.164 format.


  • The ExoPhone added should be present in your account.

  • Restrictions will depend on telecom regulations i.e. another call can only be dial-ed out from the same telecom circle/region. For example, outgoing ExoPhone cannot be set to Delhi where Incoming ExoPhone is in Bangalore.

  • Both the first leg and the second leg ExoPhones can be connected on the same server.

NOTE: If ExoPhone is not present in your account or the ExoPhone is unable to dial out i.e. if the above validation fails, then the call would be dial-ed out using the same ExoPhone as the first leg (where the incoming call landed).

NOTE: Consult with exotel support to use this feature.


default = false

true/false; Record the call or not



default = single

To record the caller and callee in separate channels in the recording file.

Possible values:

  • single

  • dual



default = 30

Value in seconds to limit the ringing duration. This can be increased up to 60 seconds.



default = 900 (15 minutes)

Value in seconds to limit the conversation duration to. This can be increased up to 75 minutes (4500 s).



default = default_tone

Possible Values:

  • default_tone: Exotel default music on hold as present here.

  • operator_tone: Audio returned by the operator on the dialing channel as is.

  • custom_tone: Audio URL as provided in the response.

Sample Values:


“type”: “default_tone”



“type”: “operator_tone”



"type": "custom_tone",

"value": "<audio_url>"



Use this option to dial the numbers in parallel (simultaneously). This will dial all the numbers returned under the destination parameter.

"parallel_ringing": {

       "activate": true,

       "max_parallel_attempts": 5


max_parallel_attempts value can be between 1-10. Default: 5

*Please note this feature is chargeable and consult with your Account Manager or email to before using this parameter.

The URL passed here will be requested for dial start and dial end events. For more details on request, refer to this.

Play a recording to the number that is being called


“playback_to”: “both”,

“type”: “audio_url”,

“value”: “http://...mp3”




“playback_to”: “both”,

“type”: “text”,

“value”: “hello, this is a sample text”




“playback_to”: “callee”,

“type”: “audio_url”,

“value”: “http://...mp3”




“playback_to”: “callee”,

“type”: “text”,

“value”: “hello, this is a sample text”


Configuration for audio file supported in this playback are:

Sample Rate = 8 kHz

Bit depth = 16 bit

Bit rate = 128 kbps

Channel = mono

File Format = wav

Note: If the file name returned in case of `audio_url` is the same, it will be cached by our servers. Kindly, provide dynamic file names if the audio to be played is different each time.

*Above set of parameters can also be controlled through the dashboard if one opts to configure the Connect applet using the flow builder instead of the Application URL.

Cases, where Fallback URL will be triggered, are:

  • Primary URL does not return HTTP 200 OK

  • Primary URL doesn’t return within the timeout period (5 seconds)

  • Primary URL returns invalid response:

    • Content-Type should be application/JSON

    • Mandatory parameters are present

    • audio_url / text should be HTTP/HTTPS and returns 200 HTTP code

Transition to next applet

Below transitions are to be set in the call flow builder to decide what to execute next.


  • After the call conversation ends: The applet set here will be triggered if a conversation occurs. 

  • If nobody answers: The applet set here will be triggered if we dial the number and conversation doesn’t occur. If no applet is present in "we didn't dial anyone", it will fallback to this.

  • We didn’t dial anyone: The applet set here will be triggered if we don’t dial. Cases when this can occur:

    • If both Primary and Fallback URL endpoint times out or returns non-2xx response code. 

    • If both Primary and Fallback URL endpoint doesn’t return a valid payload.

    • If the number to dial returned is in invalid format.

    • If an empty number (destination) is returned in the response

Contact us: If you have any questions or concerns, please connect with us using the chat widget on your Exotel Dashboard or Whatsapp us at 08088919888.