Feat/ambient sounds (#678)

* initial support for coaching mode in conference

* wip

* wip

* add support for answer verb

* wip

* wip

* wip

* wip

* wip

* updates to rename option to dub

* wip

* wip

* wip

* update verb-specs

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* add option to boost audio signal in main channel

* wip

* wip

* wip

* wip

* wip

* wip

* for now, bypass use of streaming apis when generating tts audio for dub tracks

* add nested dub to dial

* wip

* add support for filler noise

* kill filler noise when gather killed

* wip

* wip

* while using sayOnTrack, we have to enclose the say command in double quotes

* disableTtsStreaming = false

* allow transcribe of b leg only on dial verb

* dub.say can either be text or object like say verb with text and synthesizer

* remove loop for sayOnTrack

* update speech-utils

* fixes for testing transcribe verb and support for dub and boostAudioSignal in lcc commands

* add dial.boostAudioSignal

* fix bug where session-level recognizer settings incorrectly overwrite verb-level settings

* update verb specs

* update dial to support array of dub verbs

* fix bug setting gain

* lint

* wip

* update speech-utils

* use new endpoint methods for mod_dub

---------

Co-authored-by: Dave Horton <daveh@beachdognet.com>

lib/utils/place-outdial.js

@@ -295,17 +295,17 @@ class SingleDialer extends Emitter {
         if (err.status === 487) status.callStatus = CallStatus.NoAnswer;
         else if ([486, 600].includes(err.status)) status.callStatus = CallStatus.Busy;
         this.logger.info(`SingleDialer:exec outdial failure ${err.status}`);
-        inviteSpan.setAttributes({'invite.status_code': err.status});
-        inviteSpan.end();
+        inviteSpan?.setAttributes({'invite.status_code': err.status});
+        inviteSpan?.end();
       }
       else {
         this.logger.error(err, 'SingleDialer:exec');
         status.sipStatus = 500;
-        inviteSpan.setAttributes({
+        inviteSpan?.setAttributes({
           'invite.status_code': 500,
           'invite.err': err.message
         });
-        inviteSpan.end();
+        inviteSpan?.end();
       }
       this.emit('callStatusChange', status);
       if (this.ep) this.ep.destroy();