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#### Request parameters for the action URL {#refer_action} The action request contains the [Standard Request Parameters](./index.mdx#request-parameters) as well as: | Parameter | | | -: | | | ReferCallStatus string | The result of the transfer based on the reply to the SIP REFER method and the SIP NOTIFY events received afterwards. This parameter will not be reported if no SIP NOTIFY events are received. See [below](#action_referCallStatus) for all possible values. | | ReferSipResponseCode string | The code received in response to the SIP REFER method. 202 when accepted. | | NotifySipResponseCode string | The last response code reported by the SIP NOTIFY events. This is the code sent by the transfer target in response to the SIP INVITE method. This parameter will not reported if no SIP NOTIFY events are received. |
#### Values for the ReferCallStatus parameter {#action_referCallStatus} The parameter ReferCallStatus has the following values: | Value | | |--:|--| | in-progress | SIP REFER accepted and SignalWire received 200 via SIP NOTIFY. | | busy | SIP REFER accepted and SignalWire received 486 or 600 via SIP NOTIFY. | | no-answer | SIP REFER accepted and SignalWire received 487 via SIP NOTIFY. | | canceled | SIP REFER accepted, however the call ended before the transfer completed. | | failed | An error occurred through the