SIP Virtual Address

SIP Load Balancing or SIP Direct Server Response utilizes a SIP Load Balancer and multiple SIP Servers to distribute SIP traffic. The 2020 IMG can be configured to act as a SIP Server within the SIP Load Balancing network. In a SIP Load Balancing network there would be one or more 2020 IMG's configured as a SIP Server with one Load Balancer acting as a proxy to distribute the SIP traffic. To configure the 2020 IMG to function as a SIP Server, the SIP Virtual IP Address object must be configured. The SIP Virtual IP Address Object will allow a user to configure a SIP Virtual IP address which is different than the IP address configured for normal SIP traffic. Each SIP Server must be configured with the same Virtual IP address and must be configured to NOT accept or Transmit Gratuitous ARPs. See below for more information on configuration etc.

 

ClientView Pane

IMG EMS > Logical IMG > IMG Name > Signaling > SIP Signaling > SIP Virtual Address

SC_SIP_VirtualAddress.png

 

Maximum Objects

Two SIP Virtual IP Address objects can be created per SIP Signaling object. This allows Load Balancer choice of two virtual IP's to send SIP traffic which will load balance SIP traffic on one 2020 IMG.

 

Related Topics and Dependencies

To configure the 2020 IMG to act as a SIP Server there are other objects within the ClientView application that must get configured. Below is list of those dependencies along with links to any related topics.

  1. The IP addresses that will be utilized by the SIP Virtual IP Address object are configured under the IP address object. First configure the IP Address object with the Physical interface set to CPU. Enter IP address being used in the SIP Load Balancing Network.
  2. Within the IP Address object created set the Gratuitous ARP and ARP Responses field to Disable. By selecting Disable, this interface will not be able to issue a Gratuitous ARP. In addition whenever an external node attempts to ARP this Virtual IP Address, the ARP will be suppressed. Only nodes that know the VIP's MAC address will be able to send IP packets to it.
  3. The SIP Virtual IP Address object can not be accessed until after the CPU interface has been created and the Gratuitous ARP and ARP responses field has been set to Disable.

SIP-Based Load Balancing

IP Network

IP Address

SIP Signaling

 

Field Descriptions

SIP Virtual Address ID

The SIP Virtual Address ID is automatically populated with next available ID. ID's range from 1-2

 

SIP Virtual IP Address

This drop-down will be populated with any CPU Network Interface entries that have Gratuitous ARP and ARP Responses set to Disable. Select the desired entry. When the Gratuitous ARP and ARP Responses is set to Disable, the Virtual IP Address will not be allowed to issue a Gratuitous ARP. In addition, whenever an external node attempts to send an ARP to this Virtual IP Address, the ARP reply will be suppressed. Any node that knows the MAC address associated with this Virtual IP Address (through static configuration as used in Load Balancers) will be able to send packets to it. The Virtual IP Address will be able to send packets to any desired node since ARP Requests from the Virtual IP Address for an unknown IP’s MAC address will be allowed.

All outbound SIP requests will utilize the IP Address configured on 2020 IMG for normal SIP Signaling even if the outbound transaction is within a dialog which had previously used the Virtual IP Address.

 

IP Virtual Port

Default = 5060. Can be changed by clicking in the IP Virtual Port field and enter new port number.

 

Fully Qualified Domain Name

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