#vulnerable code 
                                @Override
    public String open(String sdp) throws MgcpConnectionException {
        synchronized (this.stateLock) {
            switch (this.state) {
                case CLOSED:
                case HALF_OPEN:
                    // Update state
                    this.state = MgcpConnectionState.OPEN;

                    // Parse remote SDP
                    try {
                        this.remoteSdp = SessionDescriptionParser.parse(sdp);
                    } catch (SdpException e) {
                        throw new MgcpConnectionException(e.getMessage(), e);
                    }

                    // Open connection
                    openConnection();
                    
                    if(log.isDebugEnabled()) {
                        log.debug("Connection " + getHexIdentifier() + " state is " + this.state.name());
                    }
                    
                    // Submit timer
                    if (this.timeout > 0) {
                        expireIn(this.timeout);
                    }
                    break;

                default:
                    throw new MgcpConnectionException(
                            "Cannot open connection " + this.getHexIdentifier() + " because state is " + this.state.name());
            }
        }
        return this.localSdp.toString();
    } 
                            #location 35 
                            #vulnerability type THREAD_SAFETY_VIOLATION
#fixed code
                                @Override
    public String open(String sdp) throws MgcpConnectionException {
        synchronized (this.stateLock) {
            switch (this.state) {
                case CLOSED:
                case HALF_OPEN:
                    // Update state
                    this.state = MgcpConnectionState.OPEN;

                    // Parse remote SDP
                    try {
                        this.remoteSdp = SessionDescriptionParser.parse(sdp);
                    } catch (SdpException e) {
                        throw new MgcpConnectionException(e.getMessage(), e);
                    }

                    // Open connection
                    openConnection();
                    
                    if(log.isDebugEnabled()) {
                        log.debug("Connection " + getHexIdentifier() + " state is " + this.state.name());
                    }
                    
                    // Submit timer
                    if (this.timeout > 0) {
                        expireIn(this.timeout);
                    }
                    break;

                default:
                    throw new MgcpConnectionException("Cannot open connection " + this.getHexIdentifier() + " because state is " + this.state.name());
            }
        }
        return this.localSdp.toString();
    }