Groups

Groups define sets of IP addresses/networks, telephone numbers/prefixes, and emails. These can be used across the WEB GUI, such as in alerts or filters. Typically, define SIP trunks from operators as groups for use in alerts or filters.

IP groups include a "Trunk" checkbox to distinguish internal/incoming/outgoing calls in CDR filters.

Telephone Numbers

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

Accessing Telephone Number Groups

Navigate to: GUI -> Groups -> Tel. numbers

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

1. Click the "New group" button 2. Enter a Group name 3. Add phone numbers one per line 4. 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:

1. Navigate to GUI -> Groups -> Tel. numbers 2. Click the "import/export" button 3. Prepare a text file with one phone number per line (or use the exported file as a template) 4. Upload the file 5. 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:

1. Go to the CDR view 2. Click the "Filter Form" button 3. In the Common tab, locate the "Group Filters" section 4. Select your group from the "Caller Groups" or "Called Groups" dropdown 5. 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, but there is no explicitly documented hard limit. However, for large lists of phone numbers, using groups with the import/export functionality is the recommended approach to ensure stability and maintainability.

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):

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.

AI Summary for RAG

Summary: This article explains how to configure Groups (telephone numbers, IP addresses, and emails) and IP anonymize rewrite rules in VoIPmonitor. Telephone number groups support manual entry and import/export for large lists, with automatic propagation to all filters. IP anonymize rewrite rules are used to replace original IP addresses in the database with masked values for privacy compliance (GDPR) or to hide internal network topology.

Keywords: groups, IP groups, tel numbers, telephone numbers, emails, SIP trunks, alerts, filters, import, export, CDR filter, Caller Groups, Called Groups, Trunk checkbox, IP anonymize, rewrite rules, GDPR, privacy, IP masking, network topology

Key Questions:

What are Groups and how are they used in VoIPmonitor?
How do I import a list of phone numbers into a group?
How do I filter CDRs by a large list of phone numbers?
What is the purpose of the Trunk checkbox in IP groups?
How do I configure IP anonymize rewrite rules?
How can I mask real IP addresses for GDPR compliance?
How to anonymize a network prefix while preserving host addresses?