Translating SIP sessions to multiple destination ports

Translating SIP sessions to multiple destination ports

You can use a load balance virtual IP to translate SIP session destination ports to a range of destination ports. In this example the destination port is translated from 5060 to the range 50601 to 50603. This configuration can be used if your SIP server is configured to receive SIP traffic on multiple ports.

Example translating SIP traffic to multiple destination ports

To translated SIP sessions to multiple destination ports

  1. Add the load balance virtual IP.

Adding the original IP address and port to the SIP message header after NAT

This virtual IP forwards traffic received at the port1 interface for IP address and destination port 5060 to the SIP server at IP address with destination port 5061.

config firewall vip edit “sip_port_ldbl_vip” set type load-balance set portforward enable set protocol tcp set extip set extport 5060 set extintf “port1” set mappedip set mappedport 50601-50603

set comment “Translate SIP destination port range”


  1. Add a security policy that includes the virtual IP and VoIP profile. config firewall policy edit 1 set srcintf “port1” set dstintf “port2” set srcaddr “all” set dstaddr “sip_port_ldbl_vip” set action accept set schedule “always” set service “ANY” set utm-status enable set voip-profile default

set comments “Translate SIP destination port” end

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