# Update a call in progress

This method is used to manage ongoing, connected calls. This method uses SVAML in the request body to perform various tasks related to the call. For more information about SVAML, see the Callback API documentation.

This method can only be used for calls that originate from or terminate to PSTN or SIP networks.

Endpoint: PATCH /calling/v1/calls/id/{callId}
Version: 1.0.1
Security: Basic, Signed

## Path parameters:

  - `callId` (string, required)
    The unique identifier of the call. This value is generated by the system.
    Example: "4398599d1ba84ef3bde0a82dfb61abed"

## Request fields (application/json):

  - `instructions` (array)
    The collection of instructions that can perform various tasks during the call. You can include as many instructions as necessary.

  - `action` (object)
    The action that will control the call. Each SVAML object can only include one action.


## Response 204 fields