[Home](./index.md) > [sip.js](./sip.js.md) > [SimpleUserMedia](./sip.js.simpleusermedia.md) > [constraints](./sip.js.simpleusermedia.constraints.md) ## SimpleUserMedia.constraints property Offer/Answer constraints determine of audio and/or video are utilized. If not specified, only audio is offered (audio is true, video is false). Signature: ```typescript constraints?: SimpleUserMediaConstraints; ```