TwiML

Your answer to a call is a TwiML document: XML with <Response> at its root. v1 supports the verbs below. Anything else, an unknown verb or an unsupported attribute value makes the whole document invalid: 720001 (naming it) or 720002.

Supported verbs

Verb	Supported	Notes
`Play`	`loop`, `digits`	wav, mp3 or µ-law audio from your URL
`Pause`	`length` (1-60)
`Gather`	`input="dtmf"` only, `action`, `method`, `timeout`, `finishOnKey`, `numDigits`, `actionOnEmptyResult`; nested `Play` and `Pause`	The first key press stops the nested audio at once
`Hangup`		Before the answer, the caller hears voicemail
`Reject`	`reason` (accepted, ignored)	The caller hears the SIM's voicemail, not a busy tone
`Redirect`	`method`	Doesn't answer the call
`Connect><Stream`	`url`, `name`; nested `Parameter`	Two-way live audio (Media Streams). One per call
`Start><Stream` / `Stop><Stream`	`url`, `name`, `track`	One-way live audio
`Message`	`to`, `action`, `method`	Sends a text from your line, during a call too
`Dial><Sip`	`timeout`, `action`; your line's own SIP login only	Incoming calls only, and only as the first verb

When the dongle answers

It answers only when your TwiML reaches a verb that needs audio: Play, Pause, Gather, Connect or Start. Message and Redirect keep the call ringing. Reject, Hangup, or a document that ends with the call unanswered, all send the caller to the SIM's voicemail.

Limits per call

Up to 20 TwiML fetches, 200 verbs and 60 seconds of total fetch time. Past that, the call ends with 720003.

Not in v1

Say, Record, Dial to a number, client, conference or queue, Enqueue, Leave, Pay, Prompt, Refer, Connect><Room>, Connect><ConversationRelay>, Connect><VirtualAgent>, Siprec and Transcription. Each is refused with 720001.