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Description

The Transfer Node allows you to transfer an ongoing call to a Tel or SIP target.

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Parameters

ParameterTypeDescriptionTransfer Type
Transfer TypeDropdownThere are two transfer types:
  • Refer — forwarding an existing call.
  • Dial — creating a new outgoing call. If you want to use this type and still have the old Node version, add a new Voice Gateway Transfer Node in the Flow Editor and manually transfer the required settings from the old Node.
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ReasonCognigyScriptThe reason for the handover. It is shown in Voice Gateway logs.All
TargetCognigyScriptE.164 syntax or a SIP URI are supported.All
Caller IDNumberThe caller ID. Some carriers, like Twilio, require a registered number for outgoing calls.Dial
Dial MusicURLCustom audio or ring-back which plays to the caller while the outbound call is ringing. Only .wav or .mp3 files are supported. The URL doesn’t need to include the .mp3 or .wav extension. For example, https://abc.xyz/music.mp3 or https://audio.jukehost.co.uk/N5pnlULbup8KabGRE7dsGwHTeIZAwWdr.Dial
Enable Duration Limit for TransferToggleAutomatically disconnects transferred calls after a set time to prevent excessive call durations. This setting is useful in the following cases:
  • Limit call duration by automatically ending transferred calls that exceed the predefined time, helping manage system performance.
  • Free up resources by disconnecting calls if the caller forgets to hang up, making lines available for other callers.
  • Reduce costs by preventing unnecessary charges from long, unattended calls.
Dial
Duration LimitNumberThis parameter is active only when Enable Duration Limit for Transfer is selected. Set the maximum duration in seconds. Transferred calls end automatically after this time, even if the caller is on the line. The default value is 600.Dial
TimeoutNumberThe amount of time (in seconds) that the AI Agent will ring before a no-answer timeout. The default value is 60 seconds.Dial
Enable CopilotToggleCreates the UUIValue which will be sent to the Contact Center through SIP Headers. Will collect information from the Transcription Webhook field as well as from the VG Endpoint Agent Copilot Config field to create the UUIValue. This setting requires a configured Voice Copilot Endpoint.Dial
Copilot Headers KeyCognigyScriptDefine the Headers Key for Agent Copilot. The key is provider-dependent. For example, for Genesys, the key is User-to-User. The generated value becomes accessible after engaging the Transfer Node, located in the input object as {{input.UUIValue}}. Note that you do not need to handle this value manually. It is automatically generated and added to the header.Dial
ParameterTypeDescriptionTransfer Type
STT VendorSelectorThis option is only available on Voice Gateway. Select the desired STT Vendor. For custom use all lowercase letters like microsoft, google, aws, or nuance.Dial
STT LanguageSelectorSelect the desired STT Language. For custom languages, use the following format: de-DE, fr-FR, en-US.Dial
STT LabelCognigyScriptThe alternative name of the vendor is the one you specify in the Voice Gateway Self-Service Portal. If you have created multiple speech services from the same vendor, use the label to specify which service to use.Dial
Disable STT PunctuationToggleThis parameter is active only when Google or Deepgram is selected in the STT Vendor setting.

Prevents the STT response from the AI Agent to include punctuation marks.		Dial
Deepgram ModelSelectorThis parameter is active only when Deepgram is selected in the STT Vendor setting.

Choose a model for processing submitted audio. Each model is associated with a tier. Ensure that the selected tier is available for the chosen STT language. For detailed information about Deepgram models, refer to the Deepgram documentation.		Dial
EndpointingToggleThis parameter is active only when Deepgram is selected in the STT Vendor setting.

Deepgram’s Endpointing feature watches streaming audio for long pauses that signal the end of speech. When it spots an endpoint, it finalizes predictions and returns the transcript, marking it as complete with the speech_final parameter set to true. For detailed information about Deepgram Endpointing, refer to the Deepgram documentation.

The duration for detecting the end of speech is preconfigured with a default value (10 milliseconds). If you want to change this value, use the Endpointing Time setting.		Dial
Endpointing TimeNumberThis parameter is active only when Deepgram is selected in the STT Vendor setting and the Endpointing toggle is enabled.

Customize the duration (in milliseconds) for detecting the end of speech. The default is 10 milliseconds of silence. Transcripts are sent after detecting silence, and the system waits until the speaker resumes or the required silence time is reached. Once either condition is met, a transcript is sent back with speech_final set to true.		Dial
Smart FormattingToggleThis parameter is active only when Deepgram is selected in the STT Vendor setting.

Deepgram’s Smart Format feature applies additional formatting to transcripts to optimize them for human readability. Smart Format capabilities vary between models. When Smart Formatting is turned on, Deepgram will always apply the best-available formatting for your chosen model, tier, and language combination. For detailed examples, refer to the Deepgram documentation.

Note that when Smart Formatting is turned on, punctuation will be activated, even if you have the Disable STT Punctuation setting enabled.		Dial
Google ModelDropdownThis parameter is active only when Google is selected in the STT Vendor setting.

Utilizes one of Google Cloud Speech-to-Text transcription models, with the latest_short model being the default choice. For a detailed list of Google models, refer to the Transcription models section in the Google Documentation. Keep in mind that the default value is a Google Model type that can be used if other models don’t suit your specific scenario.		Dial
Transcription WebhookCognigyScriptThe webhook is triggered with an HTTP POST whenever an interim or final transcription is received. If the STT Vendor and STT Language fields are empty, the system will use the default STT from the Set Session Config Node (if it exists) or from the Voice Gateway Self-Service Portal. The parameter supports CognigyScript, allowing it to accept dynamic content. For example, you can specify the URL as follows: https://test-hook.com?contact={{ci.contact_name}}.

Note if the Voice Copilot Endpoint is inactive, you can use any Webhook URL to receive voice call transcripts. However, when the Voice Copilot Endpoint is enabled, ensure that the specified Webhook URL is associated with it for processing.		Dial
Audio Stream SelectionSelectorSelect the source of the audio stream:
  • Caller/Called — both the incoming and outgoing audio streams of the caller and the called party.
  • Caller — the incoming and outgoing audio stream of the caller.
  • Called — the incoming and outgoing audio stream of the called party.

Ensure that the selected audio stream matches the language specified for transcription. If no audio stream is provided, the system will use the one set in the beginning, which should also match the language specified for transcription.		Dial
Answering Machine Detection (AMD) determines whether an outgoing call has been answered by a human or a machine (such as a voicemail or answering machine). When AMD is enabled, events are generated in the Flow to indicate the detection result, allowing you to take specific actions based on the outcome.For example, if a call is transferred to a user and AMD detects a machine, you will receive an event indicating the machine detection.
ParameterTypeDescriptionTransfer Type
Answering Machine DetectionToggleIndicates whether a call has been answered by a human agent or a machine.Dial
Redirect on machine detectedSelectorRedirects the call back to the Flow in case a machine was detected.Dial
Redirect textTextText to say after machine was detected before going back to the Flow. For example, Mailbox detected, your call will be redirected back to the AI Agent. Please stay in the call.Dial
For Voice Gateway 2025.19 and later, the Anchor Media parameter has been renamed to Media Path and includes more options. The previously available options correspond to:
  • Full Media — the toggled on Anchor Media parameter in earlier versions.
  • Partial Media — the toggled off Anchor Media parameter in earlier versions.
The Media Path parameter is hidden behind the feature flag FEATURE_DISABLE_VG_MEDIA_PATH, with a default value of false. It is available only in environments where the feature flag is set to false.
ParameterTypeDescriptionTransfer Type
Media PathDropdownControls the routing of RTP traffic through a media platform, such as FreeSwitch, for monitoring, transcoding, and security purposes. Select one of the following options:
  • Full Media — routes all RTP traffic through a media platform. This option is used when complete media capture is required, for example, for logging, monitoring, or other processing workflows.
  • Partial Media — this option is selected by default. Routes through a media platform only when necessary. For example, to enable transcriptions or other optional processing.
  • No Media – routes directly from the caller’s SBC to the far SBC or SIP trunk, without passing any media through the media platform. This option is primarily used for compliance purposes. When the option is selected, the system is disconnected from the media stream entirely, ensuring that sensitive data, such as credit card information, can’t be captured.
When you select Full Media or Partial Media, media anchoring process changes the addresses and ports of incoming and outgoing data:
  • Outgoing data — the source IP address and port become the IP address and port of Voice Gateway. The destination IP address and port become the IP address and port of the public network.
  • Incoming data — the source IP address and port become the IP address and port of Voice Gateway. The destination IP address and port become the IP address and port of the PBX system or local telephone.
Dial
Custom Transfer SIP HeadersToggleData that needs to be sent as SIP headers in the generated SIP message.All
Transfer SIP HeadersJSONAn object containing SIP headers that should be sent to the transferee. Each header is a key-value pair: { "Header-Name": "Header-Value" }. The following example shows a JSON object containing two key-value pairs: { "X-Caller-ID": "+1234567890", "X-Request-ID": "abc-123" }.All
Referred ByStringThis parameter is optional.

This setting allows you to change the original Referred By value, which can be a SIP URI or a user identifier such as a phone number. To define the Referred By value, you can use the following patterns:
  • SIP URI — sip:[referred-by]@custom.domain.com. In this case, the entire SIP URI will be sent as the Referred-By header. Example: "Referred-by": "sip:CognigyOutbound@custom.domain.com".
  • User Identifier — sip:[referred-by]@[SIP FROM Domain from carrier config]. Example, "Referred-By": "sip:CognigyOutbound@sip.cognigy.ai".
Refer

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Troubleshooting

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Possible 403 Error After Dial Transfer

In case you receive a 403 error log message after using a Transfer Node with Dial, check the related PCAP file in the Voice Gateway Self-Service Portal first. There you should get more information about the reason for the 403 error. Some SBCs like Twilio may reject calls from unknown numbers. In this case, it might be necessary to configure the P-Asserted-Identity header for the Transfer. To do this, turn on the Custom Transfer SIP Headers toggle in the Advanced settings of the Transfer Node, and enter the following in the JSON field: 
{
  "P-Asserted-Identity": "<sip:phonenumber@host>"
}

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Possible 487 Error After Dial Transfer

In case you receive a 487 error log message after using a Transfer Node with Dial, check the related PCAP file in the Voice Gateway Self-Service Portal first. There you should see a CANCEL method followed by the 487 Request Terminated error. This error indicates that the callee did not answer within the defined timeout. Within the Flow, you will receive the NO_ANSWER call event.