Play

The Play verb is used to play an audio file to the remote party.

Play Attributes

Name	Allowed Values	Default Value
Loop	integer > 1	1

loop. The 'loop' attribute specifies how many times you’d like the audio file to be repeated. Specifying '0' will cause the the <Play> verb to loop until the call is hung up.

Supported Audio Formats

MIME type	Description
audio/wav	wav format audio
audio/mp3	mp3 format audio
audio/wave	wav format audio
audio/x-wav	wav format audio

Media Server Audio File Format

Technical Specification and Capacity

The callapi Media Server is capable of:

Media and Codecs:

• G711 (a-Law, u-Law);

• GSM;

• Linear PCM(L16);

• G729;

• DTMF(RFC 2833, INBAND)

Media Files:

• Wav (Sample rate 8000Hz, bit rate of 16, Mono);

• mp3 (Any sample rate)

• GSM

How to Convert a Wav File to the Correct Bitrate

You can use a software call ffmpeg as follows:

ffmpeg -i source_file.wav -acodec pcm_s16le -ac 1 -ar 8000 result_file.wav

Nesting

The verb can not have any other verbs or nouns nested. Only a URL.

Examples

Example of how to use the verb:

<Response>
    <Play>http://foobar.com/demo.wav</Play>
</Response>
<Response>
    <Play>http://foobar.com/demo.mp4</Play>
</Response>