Documentation for the classic Watson Assistant experience has moved. For the most up-to-date version, see Phone integration context variables.

Phone integration context variables

You can use context variables to manage the flow of conversations with customers who interact with your assistant over the telephone.

The following tables describe the context variables that have special meaning in the context of the phone integration. They should not be used for any purpose other than the documented use.

Context variables that are set by your dialog or actions

Voice context variables set by the dialog or actions
Name	Type	Description	Default
`final_utterance_timeout_count`	Number	The time (in milliseconds) that the phone integration waits to receive a final utterance from the Speech to Text service. The timeout occurs if the phone integration does not receive a final utterance within the specified time limit, even if hypotheses continue to be generated. When the timeout occurs, the phone integration sends Watson Assistant a text update that includes the word `vgwFinalUtteranceTimeout` to indicate that no final utterance was received.	N/A
`post_response_timeout_count`	Number	The time (in milliseconds) to wait for a new utterance after the response is played back to the caller. When this timeout occurs, the phone integration channel sends a text message to the assistant that includes the word `vgwPostResponseTimeout` and sets the context variable `input.integrations.voice_telephony.post_response_timeout_occurred` to `true`.	7000
`turn_settings.timeout_count`	Number	The time (in milliseconds) to wait for a response from Watson Assistant. If this time is exceeded, the phone integration tries again to contact {{site.data.keassistant_classic_shortnshort}}. If the service still can't be reached, the call fails.	N/A
`cdr_custom_data`	object	Any JSON key/value pairs to collect and store with the CDR record at the end of the phone call. Each time this object is received, it is merged with any previously received `cdr_custom_data` context.	N/A

Example

{
  "output": {
    "generic": [
      {
        "response_type": "text",
        "text": "Hello"
      }
    ]
  },
  "context": {
    "integrations": {
      "voice_telephony": {
        "post_response_timeout_count": 10000,
        "turn_settings": {
          "timeout_count": 5000
        },
        "cdr_custom_data": {
          "key1": "value1",
          "key2": "value2"
        }
      }
    }
  }
}

Context variables that are set by the phone channel

Context variables set by the phone channel
Name	Type	Description
`sip_call_id`	string	The SIP call ID associated with the Watson Assistant session.
`sip_custom_invite_headers`	object	A JSON object containing key/value pairs defining SIP headers that are pulled from the initial SIP `INVITE` request and passed to the Watson Assistant service (for example, `{"Custom-Header1": "123"}`).
`private.sip_from_uri`	string	The SIP `From` URI associated with the Watson Assistant service.
`private.sip_request_uri`	string	The SIP request URI that started the conversation session.
`private.sip_to_uri`	string	The SIP `To` URI associated with the conversation session.
`private.user_phone_number`	string	The phone number that the call was received from.
`assistant_phone_number`	string	The phone number associated with the Watson Assistant side that received the phone call.

Input parameters that are set by the phone channel

The following input parameters are only valid for the current conversation turn.

Input parameters set by the phone channel
Name	Type	Description
`post_response_timeout_occurred`	boolean	Whether the post response timeout expired.
`barge_in_occurred`	boolean	Whether barge-in occurred.
`final_utterance_timeout_occurred`	`true` or `false`	Whether the final utterance timeout expired.
`dtmf_collection_succeeded`	boolean	Whether the DTMF collection succeeded or failed. When `true`, a DTMF collection succeeded, and returns the expected number of digits. When `false`, a DTMF collection failed to collect the specified number of digits. Even when `dtmf_collection_succeeded` is `false`, all collected digits are passed to the dialog in the input string of the turn request.
`is_dtmf`	boolean	Whether the input to Watson Assistant is dual-tone multi-frequency signaling (DTMF).
`speech_to_text_result`	object	The final response from the Speech to Text service in JSON format, including the transcript and confidence score for the top hypothesis and any alternatives. The format matches exactly the format that is received from the Speech to Text service. (For more information, see the Speech to Text API documentation.)

Example

{
  "input": {
    "text": "agent ",
    "integrations": {
      "voice_telephony": {
        "speech_to_text_result": {
          "result_index": 0,
          "stopTimestamp": "2021-09-29T17:43:31.036Z",
          "transaction_ids": {
            "x-global-transaction-id": "43dd6ce0-139a-4d76-95aa-86e03fcfc434",
            "x-dp-watson-tran-id": "6e60695e-fed7-4efe-a376-0888b027d30f"
          },
          "results": [
            {
              "final": true,
              "alternatives": [
                {
                  "transcript": "agent ",
                  "confidence": 0.78
                }
              ]
            }
          ],
          "transactionID": "43dd6ce0-139a-4d76-95aa-86e03fcfc434",
          "startTimestamp": "2021-09-29T17:43:29.436Z"
        },
        "is_dtmf": false,
        "barge_in_occurred": false
      }
    }
  },
  "context": {
    "skills": {
      "main skill": {
        "user_defined": {},
        "system": {}
      }
    },
    "integrations": {
      "voice_telephony": {
        "private": {
          "sip_to_uri": "sip:watson-conversation@10.10.10.10",
          "sip_from_uri": "sip:10.10.10.11",
          "sip_request_uri": "sip:test@10.10.10.10:5064;transport=tcp"
        },
        "sip_call_id": "QjryZsuAS4",
        "assistant_phone_number": "18882346789"
      }
    }
  }
}