> Fetch clean Markdown by appending `.md` to any page URL under https://signalwire.com/docs or requesting it with the HTTP header `Accept: text/markdown`. The root index at https://signalwire.com/docs/llms.txt lists the available documentation indexes. # channels$ > Observable of available communication channels (audio, video, messaging). ```ts get channels$(): Observable<{ audio?: string; messaging?: string; video?: string; }> ``` Observable of available communication channels (audio, video, messaging). ## channels ```ts get channels(): object ``` Available communication channels. ##### audio? > `optional` **audio?**: `string` ##### messaging? > `optional` **messaging?**: `string` ##### video? > `optional` **video?**: `string` ## **Examples** ```ts address.channels$.subscribe((channels) => { console.log('channels:', channels); }); ``` > Observable of available communication channels (audio, video, messaging).