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# Menerima input pemanggil untuk layanan audio Amazon Chime SDK PSTN
<a name="case-4"></a>

Anda menggunakan `ReceiveDigits` tindakan untuk mengumpulkan digit DTMF masuk dan mencocokkannya dengan ekspresi reguler. Ketika aplikasi media SIP menerima digit yang cocok dengan ekspresi reguler, ia memanggil AWS Lambda fungsi dengan acara`ACTION_SUCCESSFUL`. Digit yang dikumpulkan muncul dalam `ReceivedDigits` nilai dalam `ActionData` objek.

Contoh:

```
{
    "SchemaVersion": "1.0",
    "Sequence": 4,
    "InvocationEventType": "ACTION_SUCCESSFUL",
    "ActionData": {
        "ReceivedDigits": "",
        "Type": "ReceiveDigits",
        "Parameters": {
            "CallId": "{{call-id-1}}",
            "InputDigitsRegex": "{{^\d{2}#$}}",
            "InBetweenDigitsDurationInMilliseconds": {{5000}},
            "FlushDigitsDurationInMilliseconds": {{10000}}
        }
    },
    "CallDetails": {
        "TransactionId": "{{transaction-id}}",
        "AwsAccountId": "{{aws-account-id}}",
        "AwsRegion": "{{us-east-1}}",
        "SipRuleId": "{{sip-rule-id}}",
        "SipApplicationId": "{{sip-application-id}}",
        "Participants": [
            {
                "CallId": "{{call-id-1}}",
                "ParticipantTag": "LEG-A",
                "To": "{{+12065551212}}",
                "From": "{{+15105550101}}",
                "Direction": "Inbound",
                "StartTimeInMilliseconds": "{{159700958834234}}",
                "Status": "Connected"
            }
        ]
    }
}
```

Setelah pemanggil memasukkan digit yang cocok dengan pola ekspresi reguler Anda, aplikasi media SIP memanggil AWS Lambda fungsi yang mengembalikan jenis payload berikut:

```
{
    "SchemaVersion": "1.0",
    "Sequence": 5,
    "InvocationEventType": "DIGITS_RECEIVED",
    "ActionData": {
        "ReceivedDigits": "{{11#}}",
        "Type": "ReceiveDigits",
        "Parameters": {
            "CallId": "{{call-id-1}}",
            "InputDigitsRegex": "{{^\d{2}#$}}",
            "InBetweenDigitsDurationInMilliseconds": {{5000}},
            "FlushDigitsDurationInMilliseconds": {{10000}}
        }
    },
    "CallDetails": {
        "TransactionId": "{{transaction-id}}",
        "AwsAccountId": "{{aws-account-id}}",
        "AwsRegion": "{{us-east-1}}",
        "SipRuleId": "{{sip-rule-id}}",
        "SipApplicationId": "{{sip-application-id}}",
        "Participants": [
            {
                "CallId": "{{call-id-1}}",
                "ParticipantTag": "LEG-A",
                "To": "{{+12065551212}}",
                "From": "{{+15105550101}}",
                "Direction": "Inbound",
                "StartTimeInMilliseconds": "{{159700958834234}}",
                "Status": "Connected"
            }
        ]
    }
}
```

Lihat contoh kerja di GitHub: [https://github.com/aws-samples/amazon-chime-sma-on-demand-recording](https://github.com/aws-samples/amazon-chime-sma-on-demand-recording)