Capability Check API

POST Method offers an API that enables you to check the capabilities of a number to receive SMS over IP, before actually triggering the message through the Send SMS Over IP (SOIP). This API accepts raw data in JSON format.

Base URL


To check the capability of a number, perform the following steps:

Signup or Login to and create your API key

Refer to the Create an API Key page for steps to create your API key. To view the API Key and the SID, see View API Key and SID.



After you sign up, your account will be on the trial version. You must complete the KYC to access all the features in

API request to check the capability of a number to receive SMS Over IP

To check the capability of a number, use the messages/soip/capability-check endpoint with the following request method:

Request Format

curl --location --request POST '<url>/v1/<sid>/messages/soip/capability-check' \
--header 'api-key: <api-key>' \
--header 'Content-Type: <content-type>' \
--data-raw '
  "number": "<number>",
  "callback_profile_id": "<callback-profile-id>"

The following table displays the parameter used for Capability Check API:

ParameterData TypeDescription
sidStringAccount SID (Security Identifier).
content-typeStringThe format in which the data is sent.
api-keyStringAPI key generated from account.
numberString or ArrayIt contains a single Number, Numbers Separated by “,“ comma OR It can have a list of numbers in an Array.

Example 1: “9188XXXXXXXX“

Example 2: “9188XXXXXXXX, 9188XXXXXXXX“

Example 3: [“9188XXXXXXXX”, “9188XXXXXXXX“]
callback_profile_idStringA unique callback profile ID is set for each account for callback purposes. For more information, see Set up Callback Profile ID

Sample Success Response

The following success message appears with status 202 Accepted:

    "code": "MSG402",
    "message": "Request Successfully Processed",
    "data": [],
    "error": {}

Sample Failure Response

The following failure message appears:

    "code": "RBC529",
    "message": "Invalid input or validation error!",
    "data": [],
    "error": {
        "error": "Invalid input or validation error!"

Sample Request

The following is the sample request:

curl --location --request POST '' \
--header 'api-key: Axxxxxxxxxxxxxxxxxxxxxxxxxxxx3' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-raw '
  "number": "9188XXXXXXXX",
  "callback_profile_id": "\"