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I know that in some markets and some applications that SIP is a viable alternative to traditional analog and digital connectivity to the PSTN.

I have seen too many times where the promise of new technology doesn't measure up to the marketing material. This will allow you to gain more familiarity with the product, it's pros and cons, and how it can (and cannot) serve your business. Perhaps reduce the number of PRIs, and augment with SIP for failover, or additional capacity, if your call volume is seasonal, or spiky. Sounding this out, if you have not had traffic studies done, you can request one from the carrier. How much does it cost the business if you can't send / receive calls measured in minutes, hours, days?ĭoes a conversion to SIP increase your cost to support it, either in your hours, the hours of your teammates, etc.? There are more costs to consider than comparing the price of PRI's to the cost of flexible SIP service, especially in high call volume offices. If this is the case, ensure that your internet bandwidth is still sufficient assuming high call volume.Ĭan you budget to keep a fractional PRI as a failover in the event the SIP service flakes out? - I don't know your user counts, number of locations, etc. Is this SIP implementation a shared service with your internet access? If so, the more calls you have, the less internet bandwidth you will have. will they replace it in the event of a hardware failure? Will a SIP gateway be required? Does the carrier provide this? If so, make sure you know the cost of setup, and recurring monthly costs. Are the unsupported or 'roadmap' features a requirement for your end users? Verify that you understand what features are supported and not supported on the SIP trunks in your specific environment with your hardware - do not rely on the sale person - request a technical interview that you can verify your requirements with.

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Work with your provider to see if they can give you a trial period of 30 to 60 days - no charge or minimal charge.Ĭan you run this in tandem with your PRI for a while for testing? Carve a subset of non-critical users out of your user population that will only use the SIP portion, while your critical users remain on the PRI until you are satisfied. Take it step by step to get familiar with the product in your environment.

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I do not recommend a full migration from PRI to SIP, turning the PRI off, turning SIP on, then porting numbers. Quality is comparable if you are on dedicated links (avoid the internet for toll quality, business-class voice). Generally SIP costs a bit less than PRI, and can be dynamically allocated. OnSIP allows each user up to ten simultaneous device registrations for every SIP account.There seems to be many flavors of SIP, both from the service provider and on-premise perspective. Many of our customers register the SIP account they use on their office desk phone to OnSIP's mobile app and desktop app so they are never out of reach. You can register your SIP account on multiple devices simultaneously. In the example below, the SIP address is labeled 'Address of Record'.

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SIP addresses look a lot like email addresses (with our free SIP hosting feature, our users can make their SIP addresses and email addresses identical), and even the way they work is similar to how email works. SIP accounts are not to be confused with SIP addresses, which can be thought of as the SIP version of a telephone number. Once you enter in your SIP account credentials into a SIP UA, you’ll be able to make and receive calls on that user agent with your preferred caller ID.

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You can think of the SIP account as the key that activates your VoIP communications hardware and software solutions, commonly referred to as SIP user agents or SIP UAs for short. You can also freely make and receive calls to and from any SIP address on the Internet. You can make an entire network of SIP accounts for your team and call each other using extension to extension dialing for no cost. All users get a unique SIP account that they can use to provision VoIP desk phones, softphones, mobile VoIP SIP clients, etc.Ĭreating an account and adding up to 100 users is free. When you create an account with OnSIP, you can add an unlimited number of users.