Back to Blog
Tech

PBX for SIP Trunking

Published on:

February 27, 2014

Version 5.2.0 introduces a valuable improvement for extensions with multiple alias numbers. Now, when an inbound call is received, the PBX will send the called alias number to the registered device; if the number isn't on the alias list, the primary extension name is used. This change enhances the role of the PBX, so it also serves as a trunk engine. It’s particularly beneficial for SIP trunking providers, who can leverage features like PCAP recording, RTCP-XR for SLA monitoring, and the management of both IPv4 and IPv6 interfaces. Additionally, with improved CDR reporting, billing becomes easier, and the PBX scales efficiently with virtualization support.

Christian Stredicke

5.2.0 introduces a small but important improvement: if an extension has more than one alias number, it will send the called alias number to the registered device on inbound calls. In case a number was called that wasn't on the list of alias names, it will still pick the primary name of the extension.

The background for this change is the PBX isn't always used purely as a PBX. Instead, because of its functionality for dealing with devices behind NAT (session border controller) and other features like SRTP encryption, it's useful as a trunk engine. Customers register their devices as extensions on the PBX and, although the PBX treats this as extensions, what the customer sees is a SIP trunk.

Service providers who are using the Vodia PBX for SIP trunking can also benefit from the PCAP recording the PBX provides for easy, customer-based trouble shooting. Our PBX is probably one of the few that supports RTCP-XR for SLA monitoring. The automatic blacklisting feature makes it resilient against common scanners, while the multi-tenant feature can serve as additional support for to reduce the risk of unauthorized access.

That the PBX is able to operate on multiple IPv4/IPv6 interfaces makes it possible to run other SIP devices in a private network while customers see the public interface. It's even possible to have customers register on IPv6 while the private network is still on IPv4.

With the new CDR reporting, it also becomes a lot easier to bill the customer. SIP trunk providers can use the template PHP code to integrate the PBX CDR with their billing systems. Because the PBX is software based, it scales with the availability of powerful server hardware. The support for virtualization makes it possible to have a failover, with even calls staying up.

In the private network, customers can run another SIP-compliant PBX. For example, we've had a case where a customer was running a Cisco CallManager in the corporate network and needed a solution to interface with the public Internet using the PBX as the session border controller. It worked well.

Latest Articles

View All
Announcement

Unlock Smarter Workflows with the Vodia and monday.com Integration

Vodia’s latest integration with monday.com combines powerful business communications with an intuitive, AI-driven CRM platform used by 61 percent of the Fortune 500. This integration automatically logs inbound and outbound calls from your Vodia PBX directly into monday.com boards, creating and updating contact records while maintaining detailed call histories. Designed to streamline workflows and enhance collaboration, this seamless connection helps businesses save time, reduce manual data entry, and improve productivity through smarter communication management.

June 20, 2025
Editorial

Vodia and Microsoft Teams: A Robust Integration for Business

The integration between Vodia PBX and Microsoft Teams gives businesses a seamless way to combine powerful SIP-based telephony with modern collaboration tools. With advanced call control, a built-in Session Border Controller (SBC), and extensive customization options, the Vodia PBX enables organizations to manage both Teams and SIP users within a single, secure, and flexible system. This hybrid architecture allows companies to tailor their communications infrastructure to match their specific operational needs - whether across departments, locations, or user roles.

June 17, 2025
Tech

Flowroute SMS and MMS With Vodia PBX | Video Tutorial

Vodia PBX integrates seamlessly with Flowroute to enable SMS and MMS messaging within your VoIP system. This video tutorial guides you through the entire process - from setting up your Flowroute account and configuring SMS and MMS in the Flowroute portal to webhook setup for message delivery and thorough testing to ensure everything runs smoothly. Designed for businesses and service providers alike, this comprehensive guide helps you quickly and efficiently add reliable, scalable text messaging features to your communication infrastructure, enhancing your overall VoIP experience.

June 16, 2025