Groups

Groups define sets of IP addresses/networks, telephone numbers/prefixes, and emails. These can be used across the WEB GUI for filtering CDRs, configuring alerts, and other features. Groups allow you to manage large collections of identifiers efficiently and reuse them across multiple configurations.

Overview

VoIPmonitor supports three types of groups:

Group Type	Use Cases	Access Path
IP Groups	Define SIP trunks, filter by source/destination IP, distinguish internal/external calls	GUI → Groups → IPs
Telephone Number Groups	Filter CDRs by caller/called numbers, alert on specific number ranges	GUI → Groups → Tel. numbers
Email Groups	Define recipients for alerts and reports	GUI → Groups → Emails

IP Groups

IP Groups allow you to define sets of IP addresses or network ranges that can be used in CDR filters and alerts.

Creating IP Groups

Navigate to GUI → Groups → IPs
Click "New group"
Enter a descriptive group name (e.g., "Provider A SIP Trunk")
Add IP addresses or CIDR ranges, one per line
Configure the Trunk checkbox if applicable
Save the group

Trunk Checkbox

The Trunk checkbox is an important feature for IP groups. When enabled, it marks the IPs in this group as belonging to an external SIP trunk (e.g., your VoIP provider).

This allows the CDR filter to distinguish:

Internal calls – Both caller and called IPs are NOT in any trunk group
Incoming calls – Caller IP is in a trunk group, called IP is not
Outgoing calls – Called IP is in a trunk group, caller IP is not

Example IP Group Entries

192.168.1.100
10.0.0.0/24
172.16.0.0/16
2001:db8::1/128

Telephone Number Groups

Telephone number groups allow you to define sets of phone numbers or prefixes that can be used in CDR filters, alerts, and other parts of the GUI.

Creating and Managing Phone Number Groups

You can create phone number groups manually one at a time, or use the import/export functionality for large lists.

Manual Entry

Navigate to GUI → Groups → Tel. numbers
Click the "New group" button
Enter a Group name
Add phone numbers one per line
Save the group

Import/Export (Recommended for Large Lists)

The import/export feature allows you to create and manage large lists of phone numbers efficiently.

To import phone numbers:

Navigate to GUI → Groups → Tel. numbers
Click the "import/export" button
Prepare a text file with one phone number per line (or use the exported file as a template)
Upload the file
The list will be imported into a new or existing group

Example import file:

+12025551234
+12025551235
+12025551236
+447911123456

Using Phone Number Groups in CDR Filters

After creating a phone number group:

Go to the CDR view
Click the "Filter Form" button
In the Common tab, locate the "Group Filters" section
Select your group from the "Caller Groups" or "Called Groups" dropdown
Click "Search"

Benefits of using groups:

Any changes made to the group are automatically propagated to all filters where the group is used
Ideal for managing large lists of phone numbers
Groups can be reused across multiple filters and alerts

Maximum Limits

The Caller/Called manual entry fields in the CDR filter form are designed for small lists. For large lists of phone numbers, using groups with the import/export functionality is the recommended approach to ensure stability and maintainability.

Email Groups

Email groups define sets of email addresses for use in alerts and reports.

Creating Email Groups

Navigate to GUI → Groups → Emails
Click "New group"
Enter a group name (e.g., "NOC Team", "Management")
Add email addresses, one per line
Save the group

Using Email Groups

Email groups can be used in:

Alerts – Send notifications to a group of recipients
Reports – Distribute scheduled reports to multiple addresses

IP Anonymize Rewrite Rules

This feature replaces original IP addresses in the database with anonymized values. It is useful for privacy compliance (GDPR) or hiding internal network topology.

File:New IP anonymize rewrite rule.png

IP anonymization settings

Configuration Fields

Field	Description
Description	Name of the rule.
IP to anonymize	The original IP or network range you want to hide.
Mask [0-32]	Source CIDR mask (e.g., 32 for a single IP, 24 for a whole subnet).
Anonymous IP	The new IP address that will be stored in the database.
Mask [0-32]	Target mask. If this matches the source mask, the host part of the IP is preserved (1:1 mapping).

Example: Network Prefix Anonymization

To hide the real network prefix (e.g., 192.168.1.x) but keep the host addresses unique (mapping 192.168.1.55 → 10.0.0.55):

Setting	Value
IP to anonymize	192.168.1.0
Mask	24
Anonymous IP	10.0.0.0
Mask	24

Note: These rules apply only to new data processed after saving the configuration. Existing records in the database are not retroactively anonymized.

AI Summary for RAG

Summary: This page explains how to configure Groups (IP addresses, telephone numbers, and emails) and IP anonymize rewrite rules in VoIPmonitor. IP groups support the Trunk checkbox to distinguish internal/incoming/outgoing calls. Telephone number groups support manual entry and import/export for large lists. Email groups are used for alert and report distribution. IP anonymize rewrite rules replace original IP addresses in the database with masked values for privacy compliance (GDPR).

Keywords: groups, IP groups, telephone numbers, tel numbers, email groups, SIP trunks, alerts, filters, import, export, CDR filter, Caller Groups, Called Groups, Trunk checkbox, internal calls, incoming calls, outgoing calls, IP anonymize, rewrite rules, GDPR, privacy, IP masking, network anonymization

Key Questions:

What types of groups are available in VoIPmonitor?
How do I create an IP group for a SIP trunk?
What is the Trunk checkbox and how does it affect call classification?
How do I import a large list of phone numbers into a group?
How do I filter CDRs by a group of phone numbers?
How do I configure IP anonymize rewrite rules for GDPR compliance?
How to anonymize a network prefix while preserving host addresses?
How do I set up email groups for alerts?