Frequently Asked Questions About SIP Trunking

Scalability: How Many Channels Does a SIP Trunk Have?

If your company is growing, a traditional phone system will actually punish you for that. Hiring more people means adding more phone lines.

With a PRI (Primary Rate Interface), you’re using a traditional phone line to make phone calls. Each PRI circuit allows for up to 23 simultaneous calls. If you need more, you have to buy more PRIs in bundles of 23 channels at a time.

Your bill becomes unnecessarily high because you’re paying for a number of channels you don’t need. This type of system doesn’t give you the flexibility or predictability that you need in your recurring or upcoming expenses. And makes scaling particularly difficult if you’re growing your call center.

SIP trunking makes it easy to upgrade to a higher plan at any time. You can add more concurrent calls (also known as SIP channels) and phone numbers in real-time, one or many channels at a time.

What Is A SIP Channel?

Each SIP trunk can support a number of SIP channels. A SIP channel is much like a telephone line. It represents one concurrent incoming or outgoing phone call.

Is VoIP and SIP the same thing?

Although VoIP and SIP are sometimes used interchangeably, they are not the same thing. The term VoIP stands for Voice Over Internet Protocol.  It is a broad term that covers any phone call made over the Internet. The term encompasses a group of protocol technologies of which SIP is an example. In short, SIP is one of the specific protocols that enable VoIP.

How Well Do SIP Calls Sound?

Good voice quality is essential for any business communication system. With the right solution vendor and configuration in place, SIP calls can sound identical to calls made over traditional telephone lines. It is critical to choose a provider such as Five9SIP that uses a Tier-1 network. You should also ensure that you have enough internet bandwidth to support the expected number of concurrent calls.

Why Are SIP Trunks So Affordable?

If you’re looking at your current PBX bill and comparing it to Five9SIP, you've already realized what makes SIP trunking affordable.
(And now, you might also may want to pull your hair out because of all of that money you’ve been throwing away.)

Here are the reasons why SIP trunking is so affordable:

  1. You no longer need expensive POTS or PRI lines
  2. Lower rates for per-minute calling, even on metered plans
  3. Free calls between your employees and offices, whether they're in the same building or another building in another city
  4. Your business can save up to 50% of your current expenses by simply converting your old POTS or PRIs to SIP. 
What is SIP Trunking?

SIP trunking is a method of delivering telephone and other unified communications services over the internet. It works with a SIP enabled PBX (private branch exchange). SIP stands for Session Initiation Protocol and it is the communications protocol for signaling and controlling multimedia communication sessions. SIP trunking replaces traditional telephone lines or PRIs (Primary Rate Interface).

What are the benefits of SIP?

While there are many great benefits of SIP, the primary benefit is reducing your communications expenses. Most SIP trunking plans eliminate almost all long distance charges within the United States. SIP trunking is also sold in a way that can be custom tailored and much more flexible for your business. Businesses can purchase only what they currently need now and easily scale its growth or downsize at any time.

Do I need an engineer or technical expert to get started with SIP?

No. Five9SIP provides friendly support representatives that are happy to walk you through configuration and get you on your way to enjoying the benefits of SIP trunking.

These are the most common questions we are asked. If you have others, don’t hesitate to drop us a line. We hope that no one will be intimidated by the technology and miss out on the potential value that SIP can save for businesses of all sizes and types.

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