Sip.js: DOMException：无法在“RTCPeerConnection”上执行“setRemoteDescription”：无法解析 SessionDescription。 [object Object] 期望行：v=

描述错误
无法正确运行库。

DOMException：无法在“RTCPeerConnection”上执行“setRemoteDescription”：无法解析 SessionDescription。 [object Object] 期望行：v=
在http://localhost/sip-0.11.4%20 (1).js:9733:38

我在同一代码部分遇到了麻烦：

` /**
* 将远程描述设置为底层媒体实现
* @param {String} sessionDescription 要在媒体实现上设置的 SIP 消息提供的描述
* @param {Object} [options] getDescription 使用的选项对象
* @param {MediaStreamConstraints} [options.constraints] MediaStreamConstraints https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamConstraints
* @param {Object} [options.peerConnectionOptions] 如果设置它，它将使用新选项重新创建对等连接
* @param {Array} [modifiers] 一次使用描述修饰符的数组
* @returns {Promise} 一旦描述被设置就解决的承诺
*/
setDescription: { writable: true, value: function setDescription(sessionDescription, options, modifiers) {
var _this = this;

    var self = this;

    options = options || {};
    if (options.peerConnectionOptions) {
      this.initPeerConnection(options.peerConnectionOptions);
    }

    modifiers = modifiers || [];
    if (!Array.isArray(modifiers)) {
      modifiers = [modifiers];
    }
    modifiers = modifiers.concat(this.modifiers);

    var description = {
      type: this.hasOffer('local') ? 'answer' : 'offer',
      sdp: sessionDescription
    };

    return SIP.Utils.Promise.resolve().then(function () {
      // Media should be acquired in getDescription unless we need to do it sooner for some reason (FF61+)
      if (this.shouldAcquireMedia && this.options.alwaysAcquireMediaFirst) {
        return this.acquire(this.constraints).then(function () {
          this.shouldAcquireMedia = false;
        }.bind(this));
      }
    }.bind(this)).then(function () {
      return SIP.Utils.reducePromises(modifiers, description);
    }).catch(function (e) {
      if (e instanceof SIP.Exceptions.SessionDescriptionHandlerError) {
        throw e;
      }
      var error = new SIP.Exceptions.SessionDescriptionHandlerError("setDescription", e, "The modifiers did not resolve successfully");
      _this.logger.error(error.message);
      self.emit('peerConnection-setRemoteDescriptionFailed', error);
      throw error;
    }).then(function (modifiedDescription) {
      self.emit('setDescription', modifiedDescription);
      return self.peerConnection.setRemoteDescription(modifiedDescription);
    }).catch(function (e) {
      if (e instanceof SIP.Exceptions.SessionDescriptionHandlerError) {
        throw e;
      }
      // Check the original SDP for video, and ensure that we have want to do audio fallback
      if (/^m=video.+$/gm.test(sessionDescription) && !options.disableAudioFallback) {
        // Do not try to audio fallback again
        options.disableAudioFallback = true;
        // Remove video first, then do the other modifiers
        return _this.setDescription(sessionDescription, options, [SIP.Web.Modifiers.stripVideo].concat(modifiers));
      }
      var error = new SIP.Exceptions.SessionDescriptionHandlerError("setDescription", e);
      _this.logger.error(error.error);
      _this.emit('peerConnection-setRemoteDescriptionFailed', error);
      throw error;
    }).then(function setRemoteDescriptionSuccess() {
      if (self.peerConnection.getReceivers) {
        self.emit('setRemoteDescription', self.peerConnection.getReceivers());
      } else {
        self.emit('setRemoteDescription', self.peerConnection.getRemoteStreams());
      }
      self.emit('confirmed', self);
    });
  } },`