[Home](./index.md) > [sip.js](./sip.js.md) > [Subscription](./sip.js.subscription.md) ## Subscription interface Subscription. Signature: ```typescript export interface Subscription ``` ## Remarks https://tools.ietf.org/html/rfc6665 ## Properties | Property | Type | Description | | --- | --- | --- | | [autoRefresh](./sip.js.subscription.autorefresh.md) | boolean | If true, refresh subscription prior to expiration. Default is false. | | [delegate](./sip.js.subscription.delegate.md) | SubscriptionDelegate | undefined | Subscription delegate. | | [id](./sip.js.subscription.id.md) | string | The subscription id. | | [subscriptionExpires](./sip.js.subscription.subscriptionexpires.md) | number | Subscription expires. Number of seconds until the subscription expires. | | [subscriptionState](./sip.js.subscription.subscriptionstate.md) | SubscriptionState | Subscription state. | ## Methods | Method | Description | | --- | --- | | [dispose()](./sip.js.subscription.dispose.md) | Destroy subscription. | | [refresh()](./sip.js.subscription.refresh.md) | 4.1.2.2. Refreshing of Subscriptions https://tools.ietf.org/html/rfc6665\#section-4.1.2.2 | | [subscribe(delegate, options)](./sip.js.subscription.subscribe.md) | Send re-SUBSCRIBE request. Refreshing a subscription and unsubscribing. https://tools.ietf.org/html/rfc6665\#section-4.1.2.2 | | [unsubscribe()](./sip.js.subscription.unsubscribe.md) | 4.1.2.3. Unsubscribing https://tools.ietf.org/html/rfc6665\#section-4.1.2.3 |