Judul : SIP vs PRI Pros and Cons for Business PBX
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SIP vs PRI Pros and Cons for Business PBX
Business phone lines have undergone several transformations. What started with analog landlines evolved into T1 CAS digital trunks, then ISDN PRI, and finally SIP packet-based network connections. Surprisingly, all of these technologies are still available. We're going to take a closer look at the two most popular configurations used in multi-line PBXs.
Main Tariff InterfaceISDN PRI stands for Digital Services Digital Network Interface. The abbreviation PRI or ISDN PRI is often used for obvious reasons.
ISDN is a PRI telecommunications service standard based on the earlier T1 line specification. T1 began as a means of connecting 24 pairs of 2-pair twisted pair telephone lines to save on long distance cable and telephone pole charges. This was achieved by digitally multiplexing 24 individual channels so that they were all combined into one 1.5 Mbps digital signal. An additional benefit of digitization was the reduction of noise and crosstalk on long-distance calls.
The main benefit of the T1 specification is that it can reuse the telephone company's existing infrastructure, including landline lines and microwave relays. High frequency digital signals degrade relatively quickly over distance, so regenerative repeaters were added to the lines to restore the signal. With this arrangement, the T1 can be offered over long distances to serve almost all customers who used the old analog phone lines.
A problem with the T1 was that if each of the 24 channels were carrying audio-only telephone calls, additional signal cables would have to be provided. The best solution was to multiplex parts of the signal into the data stream and capture a little here and a little there on each channel. This degraded the sound slightly and allowed the T1 CAS (Channel Associated Signaling) system to work on its own.
Additional features such as caller ID were introduced by phone companies and were in demand for work phones and especially call centers. This is where PRI comes to the rescue. The same basic T1 line layout was retained, except only 23 channels were dedicated as separate telephone lines. An entire channel is allocated to handle all signals, data and other background services.
Most of today's PBXs have interface cards that you plug directly into an ISDN PRI cable and you have 23 phone lines (or as many as you ordered). If you need more than 23 lines, connect additional PRIs to add more channels.
Is there an additional interface?
No, but there is a related standard called BRI, or Basic Rate Interface. The phone companies thought it was going to be a two-line system or high-speed modem service. By the time it became widespread, computer communications had migrated to broadband, and BRI never caught up. It was popular for its ability to carry high-quality audio signals for radio broadcasts and long-distance advertising such as voiceovers. This service has recently been replaced by high speed internet and is very hard to find.
What is SIP and how is it different from PRI?
SIP stands for Session Initiation Protocol. It is a technological competitor to PRI. SIP is actually a standard for carrying VoIP or voice protocol or Internet phone calls over networks that are often shared with other computing devices.
As you might have guessed, SIP is a packet protocol, as opposed to the line protocol used by ISDN and T1. With channel systems, the entire voice channel is assigned to the conversation during the conversation. If nobody speaks, the line remains free. There are no community facilities. With VoIP telephony, a conversation is broken down into small packets that are sent over the network to their destination. Many conversations can take place on the network at the same time, as well as file transfers, print jobs and everything else digital. If the conversation drops, no packets are sent to the network for that channel only.
As you can see, VoIP is more efficient for sharing network resources. However, you have to pay for it. Sometimes everyone wants to talk or send data at the same time. If the network is not carefully designed, it can become overloaded with too many packets and too many fuses. This network congestion causes transmission delays that disrupt phone calls. Lost packets garble the conversation.
Network recommendations for SIP
Network design must be done carefully to ensure sensitive voice packets are transmitted without delay or corruption. Typically, these data streams are prioritized using class-of-service network mechanisms.
A SIP trunk is referred to as a SIP trunk. This corresponds to an ISDN PRI line. Any digital line capable of carrying Ethernet packets can be a dedicated SIP trunk, although SIP uses T1 lines, DS3 bandwidth, and carrier Ethernet services. Providing SIP phone calls with a separate line eliminates interference with other data packets. SIP trunks are most commonly used to connect corporate PBX and call center systems directly to phone service providers. Like PRI, most PBX systems have network interface cards that connect directly to the SIP trunk.
SIP against PRI
One protocol is not necessarily better than another. It depends on the application. Most PBX systems can be configured to connect to either SIP or PRI trunks, whether the phone devices themselves are analog phones or VoIP phones. SIP trunks are particularly useful in Unified Communications or Unified Communications as a Service (UCaaS) systems that combine computers, desktops, video conferencing, and mobile phones into a single interoperable system. In these systems, everything is in batch format and runs on the same network.
what suits you
The best choice of phone line is the one that works best with the system you have or want and has the lowest cost for the power you need. PRI and SIP prices have come down dramatically in recent years, so you need to evaluate which phone line options are best for your business needs.
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