Configuring How SAU Phone Numbers Are Selected

For the Simultaneously Active Users KPI, Session Monitor has a flexible mechanism for selecting the phone numbers that are extracted from the SIP headers. This flexibility is needed to ensure that only the phone numbers that respect the SAU definition are taken into account.

This is done by the use of two system settings:

• Headers to check for SAU KPI: A space separated list of header field names (max 5) to check for a user part and phone number matching the configured pattern. Order of this list matters; if the first header field is a successful match, the rest of the fields are not checked.
• Pattern for valid SAU numbers:The user part of the URI (typically the phone number) of the selected header fields from the SIP INVITE and MESSAGE messages is matched against this regular expression and if there is a match the user part is counted into the SAU count.

Note:

In addition to matching the pattern as defined above, the phone number must be registered from the SIP point of view.