Revision History

The following table shows the dates and descriptions of revisions to the Configuration Guide.

Date	Description
April 2026	Initial release.
June 2026	In System Configuration chapter, in Telephony Fraud Protection File Activation topic, adds recommendation to load the fraud protection file during a maintenance window due to potential high CPU consumption. In Session Routing and Load Balancing chapter, in ENUM Failover and Query Distribution topic, adds note about independent caching and status reporting in HA deployments. In Security chapter, in Key Usage Control topic, adds values for key-usage and extended-key-usage supported for compatibility with imported certificate records. In Transcoding chapter, Modem Tone Detection section: Updates behavior of SBC when a reINVITE is received after VBD tones have been detected, including call flow update. Describes support for hairpinned calls. Updates call flows to include X-SBC-VBD attribute. Adds call flows for when reINVITE is issued while a modem tones session is being established and for with Back to Back SBCs. Fixes typo in SIP interface options. Added clarity around ping-all-addresses and activate-config. Clarifies incompatibility between IMS-AKA and proxy-sub-events. Adds that fiber interfaces do not support manual speed/duplex configuration. Adds hmu-window-size option. Adds how to enable wildcard public user identity matching. Adds MOH details for suppress re-INVITE hold/resume call flows. Adds instructions on deleting irregular usernames. Adds information about PCMU use in placeholder m= lines in fax transcoding. In SIP Signaling Services chapter, SIP REFER Method Call Transfer section, clarifies that refer-early-bye-enhancement applies to transcoding-based RBT only, not SPL-based RBT. Updates Scheduled External Backups to include a note regarding backup intervals.

Date

Description

April 2026

Initial release.

June 2026

In System Configuration chapter, in Telephony Fraud Protection File Activation topic, adds recommendation to load the fraud protection file during a maintenance window due to potential high CPU consumption.
In Session Routing and Load Balancing chapter, in ENUM Failover and Query Distribution topic, adds note about independent caching and status reporting in HA deployments.
In Security chapter, in Key Usage Control topic, adds values for key-usage and extended-key-usage supported for compatibility with imported certificate records.
In Transcoding chapter, Modem Tone Detection section:
- Updates behavior of SBC when a reINVITE is received after VBD tones have been detected, including call flow update.
- Describes support for hairpinned calls.
- Updates call flows to include X-SBC-VBD attribute.
- Adds call flows for when reINVITE is issued while a modem tones session is being established and for with Back to Back SBCs.
Fixes typo in SIP interface options.
Added clarity around ping-all-addresses and activate-config.
Clarifies incompatibility between IMS-AKA and proxy-sub-events.
Adds that fiber interfaces do not support manual speed/duplex configuration.
Adds hmu-window-size option.
Adds how to enable wildcard public user identity matching.
Adds MOH details for suppress re-INVITE hold/resume call flows.
Adds instructions on deleting irregular usernames.
Adds information about PCMU use in placeholder m= lines in fax transcoding.
In SIP Signaling Services chapter, SIP REFER Method Call Transfer section, clarifies that refer-early-bye-enhancement applies to transcoding-based RBT only, not SPL-based RBT.
Updates Scheduled External Backups to include a note regarding backup intervals.