[Home](./index.md) > [sip.js](./sip.js.md) > [PublisherOptions](./sip.js.publisheroptions.md) > [contentType](./sip.js.publisheroptions.contenttype.md) ## PublisherOptions.contentType property > Warning: This API is now obsolete. > > TODO: provide alternative. > Signature: ```typescript contentType?: string; ```