Program: 81994
Project: 81994
Buggy source:
private RtpDescriptionPacketExtension createDescriptionPacketExt(MediaType mediaType,Map<MediaFormat,Byte> formatAndPayloadTypes,Long localSsrc){
  RtpDescriptionPacketExtension description=new RtpDescriptionPacketExtension();
  description.setMedia(mediaType.toString());
  description.setSsrc(localSsrc.toString());
  for (  Map.Entry<MediaFormat,Byte> e : formatAndPayloadTypes.entrySet()) {
    PayloadTypePacketExtension payloadType=new PayloadTypePacketExtension();
    payloadType.setId(e.getValue());
    payloadType.setName(e.getKey().getEncoding());
    if (e.getKey() instanceof AudioMediaFormat) {
      payloadType.setChannels(((AudioMediaFormat)e.getKey()).getChannels());
    }
    payloadType.setClockrate((int)e.getKey().getClockRate());
    for (    Map.Entry<String,String> en : e.getKey().getFormatParameters().entrySet()) {
      ParameterPacketExtension parameter=new ParameterPacketExtension();
      parameter.setName(en.getKey());
      parameter.setValue(en.getValue());
      payloadType.addParameter(parameter);
    }
    description.addPayloadType(payloadType);
  }
  final MediaService mediaService=LibJitsi.getMediaService();
  SourcePacketExtension sourcePacketExtension=new SourcePacketExtension();
  final String label=UUID.randomUUID().toString().replace("String_Node_Str","String_Node_Str");
  final String msLabel=UUID.randomUUID().toString();
  sourcePacketExtension.setSSRC(localSsrc);
  sourcePacketExtension.addChildExtension(new ParameterPacketExtension("String_Node_Str",mediaService.getRtpCname()));
  sourcePacketExtension.addChildExtension(new ParameterPacketExtension("String_Node_Str",msLabel + "String_Node_Str" + label));
  sourcePacketExtension.addChildExtension(new ParameterPacketExtension("String_Node_Str",msLabel));
  sourcePacketExtension.addChildExtension(new ParameterPacketExtension("String_Node_Str",label));
  description.addChildExtension(sourcePacketExtension);
  return description;
}

Fixed version (ground truth):
/** 
 * Create <tt>RtpDescriptionPacketExtension</tt> with specified mediatype, media formats, payload type ids and ssrcs.
 * @param mediaType
 * @param formatAndPayloadTypes
 * @param localSsrc
 * @return
 */
private RtpDescriptionPacketExtension createDescriptionPacketExt(MediaType mediaType,Map<MediaFormat,Byte> formatAndPayloadTypes,Long localSsrc){
  RtpDescriptionPacketExtension description=new RtpDescriptionPacketExtension();
  description.setMedia(mediaType.toString());
  description.setSsrc(localSsrc.toString());
  for (  Map.Entry<MediaFormat,Byte> e : formatAndPayloadTypes.entrySet()) {
    PayloadTypePacketExtension payloadType=new PayloadTypePacketExtension();
    payloadType.setId(e.getValue());
    payloadType.setName(e.getKey().getEncoding());
    if (e.getKey() instanceof AudioMediaFormat) {
      payloadType.setChannels(((AudioMediaFormat)e.getKey()).getChannels());
    }
    payloadType.setClockrate((int)e.getKey().getClockRate());
    for (    Map.Entry<String,String> en : e.getKey().getFormatParameters().entrySet()) {
      ParameterPacketExtension parameter=new ParameterPacketExtension();
      parameter.setName(en.getKey());
      parameter.setValue(en.getValue());
      payloadType.addParameter(parameter);
    }
    description.addPayloadType(payloadType);
  }
  final MediaService mediaService=LibJitsi.getMediaService();
  SourcePacketExtension sourcePacketExtension=new SourcePacketExtension();
  final String label=UUID.randomUUID().toString().replace("String_Node_Str","String_Node_Str");
  final String msLabel=UUID.randomUUID().toString();
  sourcePacketExtension.setSSRC(localSsrc);
  sourcePacketExtension.addChildExtension(new ParameterPacketExtension("String_Node_Str",mediaService.getRtpCname()));
  sourcePacketExtension.addChildExtension(new ParameterPacketExtension("String_Node_Str",msLabel + "String_Node_Str" + label));
  sourcePacketExtension.addChildExtension(new ParameterPacketExtension("String_Node_Str",msLabel));
  sourcePacketExtension.addChildExtension(new ParameterPacketExtension("String_Node_Str",label));
  description.addChildExtension(sourcePacketExtension);
  return description;
}