How do I configure the SIP call bandwidth limit on the AR router

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In scenarios where the SIP server is deployed on the public network and SIP phones on the private and public networks communicate with each other, if the bandwidth is insufficient, the communication quality will be affected. Call Admission Control (CAC) and the total bandwidth can be configured on the NAT device to limit the SIP call bandwidth. If an SIP call exceeds the specified bandwidth, the call is rejected.
The configuration is as follows:
Run the nat sip cac enable bandwidth command to enable the CAC function and set the total bandwidth.

Other related questions:
How to configure bandwidth limiting on an AR?
Traffic shaping, traffic policing, and interface-based rate limiting can be configured to limit bandwidth. 1. Configuration commands: The qos gts command configures traffic shaping. The qos car command configures traffic policing. The qos lr command configures interface bandwidth. 2. Log in to the web system, choose QoS > Traffic Management > Policy Parameter Configuration, and set parameters.

How do I set the call bandwidth for the TE series endpoint?
The TE series endpoint can have the maximum incoming call bandwidth and the default call bandwidth configured. The actual incoming call bandwidth cannot be greater than the maximum incoming call bandwidth. The actual incoming call bandwidth is irrelevant to the default bandwidth available to outgoing calls, but is related to the call bandwidth specified in the conference template. On the web interface, choose System Settings > Conference. On the Normal tab, set Default call bandwidth and Maximum incoming call bandwidth.

How do I configure NQA on the AR router
The procedure for configuring NQA on the AR router is as follows: 1. Run the system-view command to enter the system view. 2. Run the nqa test-instance command to create an NQA test instance. 3. Run the test-type command to configure the type of the NQA test instance. 4. Configure mandatory parameters based on the type of the NQA test instance. (For the NQA test instance of ICMP, the destination IP address needs to be specified. For the NQA test instance of DHCP, the source interface for sending DHCP Request messages needs to be specified. For the NQA test instance of DNS, the destination domain name needs to be specified. 5. Configure optional parameters as needed, for example, test period and timeout interval. 6. Configure association. The NQA test instance can be associated with VRRP and static route.

How to configure a rate limit for ARP packets on an AR router
If a router processes a great number of ARP packets at the same time, the CPU may be overloaded and then fails to process other services. Before the processing, set a rate limit for ARP packets on the router to protect CPU resources. The router supports the rate limit function based on source MAC addresses or source IP addresses of packets, super VLAN, global ARP packets, or ARP packets transmitted over a specified interface. (1) Configure a rate limit for ARP packets according to a source MAC address. a. Access the system view, and run the arp speed-limit source-mac maximum command to configure a rate limit for ARP packets according to any source MAC address. b. Run the arp speed-limit source-mac mac-address maximum command to configure a rate limit for ARP packets for users with a specified MAC address. If both the configurations are available, when the source MAC address in the ARP packets matches the specified MAC address, the rate limit for the ARP packets is the maximum value of the configuration in step b. Otherwise, the rate limit is the maximum value of the configuration in step a. By default, the router sets the rate limit for ARP packets containing any source MAC address to 0. That is, the router does not limit the rate of ARP packets according to the source MAC address. (2) Configure a rate limit for ARP packets according to a source IP address. a. Access the system view, and run the arp speed-limit source-ip maximum command to configure a rate limit for ARP packets according to any source IP address. b. Run the arp speed-limit source-ip ip-address maximum command to configure a rate limit for ARP packets for users with a specified IP address. If both the configurations are available, when the source IP address in the ARP packets matches the specified IP address, the rate limit for the ARP packets is the maximum value of the configuration in step b. Otherwise, the rate limit is the maximum value of the configuration in step a. By default, the router allows a maximum of five ARP packets (with the same source IP address) to be released within one second. (3) Configure a global rate limit for ARP packets and a rate limit for ARP packets transmitted over a specified interface. Access the system view, and run the interface interface-type interface-number command to access the interface view. Run the arp anti-attack rate-limit enable command to enable the ARP packet rate limit function. (Optional) Run the arp anti-attack rate-limit packet-number [ interval-value ] to configure a rate limit and time of ARP packets. Run the arp anti-attack rate-limit alarm enable command to enable the ARP packet discard alarm function. (Optional) Run the arp anti-attack rate-limit alarm threshold threshold command to configure an ARP packet discard alarm threshold. (4) Configure a rate limit for ARP packets for the VLANIF interface of a super VLAN. Access the system view, and run the arp speed-limit flood-rate rate command to configure a broadcast transmission rate limit for ARP request packets under the VLANIF interfaces of all super VLANs.

What is the trunk of the AR router
A trunk is a logical link between two exchange offices. Inter-office calls must be transmitted by trunks. The AR router supports the following trunks: - A PRA trunk is connected to a VE1 interface and is usually used to connect two PBXs. - AT0 trunk: An AT0 trunk is connected to an FXO interface. It is an analog circuit trunk and uses the FXO interface of the AR to connect to the PSTN through a common telephone line. If PBX users in an enterprise need to make local calls to external users or to make toll calls, the AT0 trunk is configured. - SIP trunk: SIP trunk includes SIP AT0, SIP PRA and SIP IP trunks. A SIP trunk is established on an IP link and connects a PBX and an IMS. - E1R2 trunk: An E1R2 trunk is connected to a VE1 interface. The E1R2 trunk is usually used to connect two PBXs. If the remote device uses R2 signaling, use the E1R2 trunk to connect to the AR to the remote device. (Note: V200R002C00 and later versions support the E1R2 trunk.) - H323 trunk: An H323 trunk is established on an IP link and connects a PBX and an IMS or PBXs in different areas. (Note: V200R002C01 and later versions support the H323 trunk.) - BRA trunk: A BRA trunk is connected to a BRA interface. It can be used to connect a PBX to the ISDN. (Note: V200R002C02 and later versions support the BRA trunk.)

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