Blog

Can I use SIP if my PBX is behind a NAT firewall?

Yes, using SIP registration, this is possible.

Two Types of SIP Providers

In my experience, I've come across two types of organizations who sell SIP service.

SIP Trunks Without an IP PBX

Can this be done? We're doing it. By using third party equipment, we can terminate SIP trunks and convert back to traditional PRI signaling. This extends the benefits of SIP trunking to those that don't want to upgrade their PBX yet.

Do I need a specific type of VOIP phone system?

Different SIP providers are certified to work with various IP phone system manufactures. Some IP phone system manufactures require additional equipment to operate. Check with an Access Technologies representative to determine if your phone system is certified.

SIP – A great disaster recovery solution!

Beyond simply saving large sums of money, SIP is also a great disaster recovery / business continuity solution. Up until now, we have just had to accept the fact that we can’t build any sort of reasonable amount of redundancy into our phone services. The proper deployment of an IP phone system and SIP trunking providers has changed that and Inflow has been leading that charge for over three years now!

SIP: How to save money on phone bills?

I get so excited about the technology, how to deploy it, what it looks like in a fail-over scenario, etc. I often forget to talk about how to use SIP to save money on phone bills. Cost-savings related to SIP is the number one reason why our ShoreTel and Allworx business is flourishing in this economy. It is also the reason why my company is growing rapidly. Once people can get their head around this concept - the light goes on! SIP trunks can save a business 40% to 70% on their phone bills! So without spewing out a brochure to you, I'll talk to the real-world experiences we've come across and implemented and how to save money on phone bills.

How does 911 work with SIP trunks?

Actually, 911 works very well. With Broadvox, it’s all about the number that is out-pulsed from the customer’s telephone system (which is usually easily configurable in the phone system). The number out-pulsed has to be a 911-registered number with Broadvox. The following examples illustrate this:

Why is Inflow Communications so involved with SIP?

Hello, my name is Travis Dillard. As of the last couple years, I've become very involved with SIP - Session Initiation Protocol technology. In addition to being a prominent SIP provider, my company, Inflow Communications (www.inflowcomm.com), located in Portland, OR, provides business phone systems and implementation services for clients throughout the Northwest. Our IP PBX solutions include ShoreTel and Allworx.

Can I purchase SIP services that give me unlimited long distance?

Yes. Pricing usually depends on the SIP provider and term.

Can I port numbers from any state to my SIP trunks?

Yes, one of the fantastic things about SIP is that you can source or port numbers from any state to your SIP trunks (regardless of where the SIP trunks are terminated). However, there are a few areas in the country where not all numbers can be ported. Check with Access Technologies or an Access Technologies Agent to be sure. This also depends on the SIP provider.

What contractual obligations do I have with SIP trunks?

This depends on the SIP provider. Broadvox allows for month-to-month, 1-year, 2-year, and 3-year terms. Month-to-month contracts require that the customer pay monthly with an automatic credit card deduction.

Does placing SIP calls over the Internet cause quality issues?

With SIP trunks, voice gets converted into IP packets. These IP packets then get sent to the SIP provider (and vice versa). Because voice is real-time sensitive, it requires that the voice packets arrive within a certain amount of time and in the right order (along with a number of other factors like jitter, packet loss, etc). If some of the voice packets get dropped or if they are sent too slow, audible quality issues can occur. So the quality of the connection between the customer’s phone system and the SIP provider directly affects the quality of the call.