To have a better experience, please upgrade your IE browser.upgrade
Questo sito utilizza cookie di profilazione (propri e di terze parti) per ottimizzare la tua esperienza online e per inviarti pubblicità in linea con le tue preferenze. Continuando a utilizzare questo sito senza modificare le tue preferenze acconsenti all’uso dei cookie. Se vuoi saperne di più o negare il consenso a tutti o ad alcuni cookie clicca qui>
The website that you are visiting also provides Arabian language. Do you wish to switch language version?
يوفر موقع الويب الذي تزوره المحتوى باللغة العربية أيضًا. هل ترغب في تبديل إصدار اللغة؟
The website that you are visiting also provides Russia language Do you wish to switch language version?
Данный сайт есть в английской версии. Желаете ли Вы перейти на английскую версию?
Smart Modular Data Centers
Prefabricated Modular Data Centers
Precision Air Conditioners
Data Center Management
Handsets and Terminals
Rapid Deployment System
Platform or Infrastructure
Core Network Devices
Radio Access Network Devices
Firewall and Application Security Gateway
DDoS Protection Systems
Anti-APT Based on Big Data Analysis
Multi-service Control Gateways
Multi-Service Transport Platforms
AR Series IoT Gateways
AR Series Access Routers
Hybrid Flash Storage
Integrated Video Site Solution
Enterprise Telecom Energy
Smart Site Management System
Multi-Service Transmission Platforms
HD Network Cameras
Video Cloud Nodes
Video Content Management
Indoor Access Points
Outdoor Access Points
Scenario-specific product series
IT Infrastructure Storage Solutions
Data Center Network
Data Center Energy
Enterprise Communications Solution
Contact Center Solution
Advisory and Implementation
Support and Optimization
Training and Certification
Explore Technology Services
National Research and Education Network
Education Cloud Data Center
Multi-Channel HD Telemedicine Solution
Over The Top/Multi-Tenant Data Center (OTT/MTDC)
Internet Exchange Point (IXP)
Internet Access Provider (IAP)
Design & Simulation
Planning & Analytics
Oil & Gas IoT
HPC & Operations Management
Visualized Emergency Communication
Digital Urban Rail
Retail Cloud Platform
Intelligent Operations Center
Power Transmission Communications Network
FusionSolar Smart PV
Power Distribution Automation Communications
Advanced Metering Infrastructure
Enterprise Data Center
Enterprise Cloud Communications
Network Management System
Buy from Huawei
If you need to get information about your project, please submit your information and we will contact you within one working day.
Consult online customer service regarding products/solutions you are interested in.
If your company has signed an eDeal contract with Huawei, please buy your required product/solution via the link below.
Buy from resellers
Search for a nearby reseller and get direct contact information.
Find a Partner
Become a Partner
Alliance and solution Partner
Huawei Authorized Learning Partner
Huawei Authorized Information and Network Academy
The ViewPoint 8650 MCU is connected to the Internet. The ViewPoint9000 series videoconferencing endpoint is connected to the intranet. Static NAT for the endpoint has been configured on the firewall. The endpoint has registered with the embedded GK of the MCU. The GK is online. A conference is initiated on the web interface of the MCU. When you make a call to the endpoint on the MCU web interface, the call failed. A message indicating that the peer end does not respond to the TCP connection or does not answer the call is displayed.
Step 1 On the MCU web interface, check the causes for the call failure.
1. Choose Conferences > Ongoing Conferences.
2. On the Ongoing Conferences page, select the endpoint that fails to join the current conference, click Message in the lower left corner of the page, and check the cause for the call failure. The cause is that the peer end does not respond to the TCP connection or does not answer the call.
Step 2 Capture signaling packets on the MCU.
3. Log in to the MCU web interface, choose Settings > Maintenance > MCU Packet Capture and click Start Packet Capture, as shown in Figure 1-1.
Figure 1-1 Start Packet Capture
4. Initiate a conference and call the endpoint to join the conference.
5. When the endpoint is being connected, log in to the MCU web interface, choose Settings > Maintenance > MCU Packet Capture and click Stop Packet Capture, as shown in Figure 1-2.
Figure 1-2 Stop Packet Capture
6. On the MCU web interface, choose Settings > Maintenance > Export and click Export Packets Captured by MCU, as shown in Figure 1-3.
Figure 1-3 Export Packets Captured by MCU
Step 3 Analyze the exported MCU signaling packets.
1. Refer to Figure 1-4 to perform the following operations:
a. Enter h225 || q931 to filter messages. The result shows that the endpoint has registered with the GK, but has no setup connection signaling.
b. View the registration request message sent by the endpoint. The call signal address, that is, 192.168.1.99 (1720), of the endpoint is an intranet address.
c. Check for the Super Network Passport (SNP) redirection message that the endpoint sends to the MCU. No such message is found.
Figure 1-4 Analyzing captured MCU packets
2. Refer to Figure 1-5 to perform the following operation:
Enter ip.addr == 192.168.1.99 && tcp.port == 1720 to filter messages. The found message shows that the MCU attempts to establish a TCP connection with the ViewPoint9000 series videoconferencing endpoint using the IP address 192.168.1.99, but the attempt fails.
Figure 1-5 Address filtering
Step 4 Enable NAT on the ViewPoint9000 series videoconferencing endpoint.
Log in to the web interface of the ViewPoint9000 series videoconferencing endpoint, choose System Settings > Network > Security and Service, set Use NAT to Enable, and set NAT Address to 126.96.36.199, as shown in Figure 1-7.
Figure 1-6 Enabling NAT on the endpoint
The endpoint is connected to the intranet, but NAT is not enabled for the endpoint. As a result, the endpoint uses a CS address, which is an intranet address, to establish a TCP connection with the MCU. The MCU cannot establish a TCP connection with an intranet address, resulting in the call failure.
l In an H.323 call process, three handshakes for establishing a TCP connection are required before a setup signaling is initiated. If the TCP connection fails to be established, a message indicating TCP connection timeout or no response to the TCP connection is displayed. If this occurs, the IP address of the endpoint may be incorrect, or the call port is unreachable. Check firewall settings, as shown in Figure 1-8. Ensure that the call port of the endpoint is 1720 (by default).
Figure 1-1 Checking firewall settings
l If the onsite network involves traversal between private and public networks, NAT is required. In this case, you need to configure the Application Layer Gateway (ALG) on the firewall or enable NAT on the endpoint.
The H.323 ALG function provided by some vendors is not optimized. It is recommended that NAT be enabled on endpoints.