code: function (changes, cb) {
          var self = this;
  
          this._log('info', 'Initiating incoming session');
  
          this.state = 'pending';
  
          this.pc.isInitiator = false;
          this.pc.handleOffer({
              type: 'offer',
              jingle: changes
          }, function (err) {
              if (err) {
                  self._log('error', 'Could not create WebRTC answer');
                  return cb({condition: 'general-error'});
              }
              cb();
          });
      }
docs: ---------------------------------------------------------------- Jingle action handers ----------------------------------------------------------------