What's Best Between PRI & SIP trunking?

Telecom Business Review | Thursday, November 11, 2021

Selecting PRI vs. SIP will rely on your business needs and the level of investment your company is capable or willing to make to update its call infrastructure.

FREMONT, CA: Businesses must be more agile and respond quickly to the continually evolving needs of their customers and partners. Voice communications play a key role in accomplishing this goal, making phone service companies rely on internal and external communications as key business enablers.

Primary rate interface (PRI) & Voice over Internet Protocol (VoIP), also usually called session internet protocol (SIP) trunking, are two communication solutions extensively used by companies today. However, each approach has its benefits based on your company's requirements.

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Difference between PRI vs. SIP trunking.

When a call comes into a business with PRI, it goes through a private branch exchange (PBX) system that allows employees to communicate inwardly with each other and with external callers. Once a call enrolls a PBX, it is sent across an analog copper phone line or an ISDN(integrated services digital network) line to reach its intended recipient.

What is PRI trunking?

PRI is a telecommunications standard that utilizes physical copper phone lines to make a digital connection between your business site and the PSTN(public switched telephone network). One PRI can support 23 voice channels plus one channel that supports various call functionality and provides call data like a caller's name and phone number.

This allows voice, data, and video traffic to be transmitted on the same line in increments of 1.54Mbps, providing speed, dependability, and enhanced security for business phone systems.

A PRI circuit can be more effective and less expensive than a conventional business phone service because it can be split into various channels instead of using separate analog trunks. For example, in place of receiving a busy signal with a traditional business phone service, PRI would allow a caller to be directed to voicemail if the line was busy.

What is SIP trunking?

SIP trunking secures modern VoIP phone systems and endorses the transmission of voice and multimedia communications, comprising customary phone calls and video conferencing. Unlike analog phone lines, SIP-based phone systems are virtualized and employ an internet connection and an IP-enabled PBX to transmit communications data.

Compared to PRI, SIP allows businesses to scale up or down their telecommunications resources on demand, making them more cost-efficient and better managing their call capacity. As a result, SIP is usually the best approach if your business wants to modernize its call infrastructure while continuing to be more flexible and agile as your business needs change.

Understanding the advantages of PRI vs. SIP

One advantage of PRI trunking is that it supports businesses in simplifying their communications infrastructure. For example, one PRI connection can handle local and long-distance calls concurrently because it can transmit this data across different channels.

PRI trunking also enables businesses that aren't yet ready or don't have the funds to upgrade their systems to link legacy PBX systems to this line without relying on data bandwidth to support voice communications.

In contrast, along with the flexibility SIP provides, it also can serve as the foundation for businesses that want to implement cloud-based integrated communications solutions that facilitate collaboration across different devices, applications, and platforms.

SIP is fitted for businesses with a distributed workforce or operates in a hybrid working environment where some employees are in-office and others work distantly from home or at satellite locations.

Conversely, PRI trunking depends on a circuit to create physical connections, which means it doesn't have the same capacity to dispense telecommunications resources and data across multiple dispersed locations. Nevertheless, it offers the advantage of greater security since data is transmitted over a private telephone network rather than an internet connection. In addition, call quality may also be better due to these physical connections.

Migrating your telecommunications infrastructure

Selecting PRI vs. SIP will rely on your business requirements and the level of investment your company is capable or willing to make to update its call infrastructure.

If you're a fast-growing business, upgrading your infrastructure and expanding your call capacity with SIP trunking may be time. On the other hand, if most or a rising segment of your workforce is remote, SIP may be the better choice to facilitate greater collaboration, productivity, and efficiency within your organization.

While SIP is safe, internet connections come with innate security vulnerabilities in contrast to private connections, which makes strong password security, and 24/7 threat intelligence. With a managed service provider and a zero-trust approach, even more important with SIP-based phone systems. If your chief interest is reliability, call quality, and security, relying on PRI trunking and connecting legacy PBX systems to a devoted line with multiple channels may be the best approach for your business.

To emigrate to a SIP-based system, you'll require a SIP proxy that connects to your existing PBX and a SIP-enabled phone or gateway. You'll also need to resettle your current PSTN connection to a SIP-based one. This process involves time and money, even if you work with an outer provider. Consider all these factors as your company decides whether to shift to a SIP-enabled VoIP system or leverage a PRI connection to elevate its telecommunications infrastructure.

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