[Home](./index.md) > [sip.js](./sip.js.md) > [InviterOptions](./sip.js.inviteroptions.md) ## InviterOptions interface Options for [Inviter](./sip.js.inviter.md) constructor. Signature: ```typescript export interface InviterOptions extends SessionOptions ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [anonymous](./sip.js.inviteroptions.anonymous.md) | boolean | If true, an anonymous call. | | [earlyMedia](./sip.js.inviteroptions.earlymedia.md) | boolean | If true, the first answer to the local offer is immediately utilized for media. Requires that the INVITE request MUST NOT fork. Has no effect if inviteWithoutSdp is true. Default is false. | | [extraHeaders](./sip.js.inviteroptions.extraheaders.md) | Array<string> | Array of extra headers added to the INVITE. | | [inviteWithoutSdp](./sip.js.inviteroptions.invitewithoutsdp.md) | boolean | If true, send INVITE without SDP. Default is false. | | [params](./sip.js.inviteroptions.params.md) | {
fromDisplayName?: string;
fromTag?: string;
fromUri?: string | URI;
toDisplayName?: string;
toUri?: string | URI;
} | | | [renderbody](./sip.js.inviteroptions.renderbody.md) | string | | | [rendertype](./sip.js.inviteroptions.rendertype.md) | string | | | [sessionDescriptionHandlerModifiers](./sip.js.inviteroptions.sessiondescriptionhandlermodifiers.md) | Array<SessionDescriptionHandlerModifier> | Modifiers to pass to SessionDescriptionHandler's getDescription() and setDescription(). | | [sessionDescriptionHandlerOptions](./sip.js.inviteroptions.sessiondescriptionhandleroptions.md) | SessionDescriptionHandlerOptions | Options to pass to SessionDescriptionHandler's getDescription() and setDescription(). |