====== adv.dtmfInfo ======
wrtc.adv.dtmfInfo is a boolean property that controls if DTMF codes should be sent outband too.

The Chrome browser can send DTMF tones //inband//, as audio tones in the media stream.

Other browsers are not capable of that, but need to send DTMF tones //outband//, as SIP INFO messages.

[[ixnx:wrtc:js:api:call:senddtmf|call.SendDTMF()]] will send DTMF tones inband in Chrome and outband on other browsers.

To send DTMF tones //both// inband and outband on Chrome set wrtc.adv.dtmfInfo=true

wrtc.adv.dtmfInfo only affects behavior on Chrome browser.

===== Value =====
Boolean controlling outband transmit:
  * true: send DTMF both inband and outband on Chrome, only outband on other browsers
  * false: send DTMF inband on Chrome, outband on other browsers

===== Default value =====
false

===== Usage =====
wrtc.adv.dtmfInfo can be set before calling [[ixnx:wrtc:js:api:call:senddtmf|call.SendDTMF()]].