Note
This feature supports A/AAAA queries only. Ensure that the SIP Trunk Group services parameter dnsSupportType is set to 'a-only' when using this feature (see SIP Trunk Group - Services - CLI).


The filterSipSrc object allows only those SIP messages originated from source to appear in the list of learned/resolved IP addresses from configured FQDN entry.

Use the following CLI syntax to force the SBC to query the external DNS server for the selected FQDN entry. This request essentially instructs the SBC to ignore locally cached records and perform an external query to the configured DNS server.

% request addressContext <addressContext name> zone <zone name> filterSipSrc fqdnEntry <fqdnEntry/name> <fqdnEntry/type> forceDnsQuery

Command Syntax

% set addressContext <address_context_name> zone <zone_name> filterSipSrc 
	fqdnEntry <fqdnname> <fqdntype: a | aaaa>
	state <disabled | enabled>

% show addressContext <address_context_name> zone <zone_name> filterSipSrc

% delete addressContext <address_context_name> zone <zone_name> filterSipSrc fqdnEntry <fqdnname> <fqdntype>

Command Parameters

Parameter

Length/Range

Description

fqdnEntry/name

Up to 64 characters

Enter the FQDN name associated with this filter.

fqdnEntry/type

N/A

Enter the FQDN type associated with this filter.

  • a – IPv4
  • aaaa – IPv6

state

N/A

Enable flag to apply filtering on incoming SIP messages.

  • disabled (default) –  No filtering is applied.
  • enabled – Incoming SIP message is filtered. Any source SIP packet not belonging to one of the learned/resolved IP addresses from the configured FQDN entry is dropped.
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