[Home](./index.md) > [sip.js](./sip.js.md) > [Body](./sip.js.body.md) > [contentDisposition](./sip.js.body.contentdisposition.md) ## Body.contentDisposition property If the Content-Disposition header field is missing, bodies of Content-Type application/sdp imply the disposition "session", while other content types imply "render". https://tools.ietf.org/html/rfc3261\#section-13.2.1 For backward-compatibility, if the Content-Disposition header field is missing, the server SHOULD assume bodies of Content-Type application/sdp are the disposition "session", while other content types are "render". https://tools.ietf.org/html/rfc3261\#section-20.11 Signature: ```typescript contentDisposition: string; ```