| Name | Type | Description | Notes |
|---|---|---|---|
| sipAddress | String | The SIP URI to which the call will be referred to. | |
| clientState | String | Use this field to add state to every subsequent webhook. It must be a valid Base-64 encoded string. | [optional] |
| commandId | String | Use this field to avoid execution of duplicate commands. Telnyx will ignore subsequent commands with the same `command_id` as one that has already been executed. | [optional] |
| customHeaders | List<CustomSipHeader> | Custom headers to be added to the SIP INVITE. | [optional] |
| sipAuthUsername | String | SIP Authentication username used for SIP challenges. | [optional] |
| sipAuthPassword | String | SIP Authentication password used for SIP challenges. | [optional] |
| sipHeaders | List<SipHeader> | SIP headers to be added to the request. Currently only User-to-User header is supported. | [optional] |