====== sendDTMF() ======
call.sendDTMF() sends DTMF tones during a call. It can only be used to send tones while already in a call - not to place a call.

Tone duration is 300 ms, with 100 ms pause between each tone.

===== Arguments =====
call.sendDTMF(sequence)
  * sequence - string containing DTMF tone sequence. Valid characters are **0**-**9**, **A**-**D**, **#**, and **%%*%%**. Pause: **p** or **,** can be used to insert a delay of 2 seconds into the sequence.

===== Returns =====
Nothing.

===== Events =====
None.

===== Example =====
call.sendDTMF("12p34") sends DTMF tones for 1 and 2, pauses 2 seconds, then sends tones for 3 and 4.

===== Inband, Outband =====
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.

call.sendDTMF() will send DTMF tones inband in Chrome and outband on other browsers.

<WRAP center round tip 100%>
To send DTMF tones //both// inband and outband on Chrome set [[ixnx:wrtc:js:api:wrtc:adv.dtmfinfo|wrtc.adv.dtmfInfo]]=true
</WRAP>