SIP trunks are simply another way of saying VoIP Provider for your phone system. A SIP trunk is a connection from a PBX (phone system) using SIP (Session Initiation Protocol) to an ITSP (Internet Telephony Service Provider).
It might sound complicated but it’s really quite simple, SIP trunks take the place of your legacy telephone company. Most phone systems out there today are more than a couple of years old and are likely based on circuit switched technology. Newer IP-PBXs use packet switching technology, which means they leverage the Internet to deliver the same features you have now, and then some. The difference could be minor or major depending on what your PBX is capable of and what your ITSP can deliver in terms of features and functionality.
Since the PSTN (public switch telephone network) is tied to aging circuit switched technology it has limitations in terms of what media it can support. Essentially, it can deliver low quality voice, that’s it.
SIP Trunks replace older PRI and POTS interfaces that we are used to and bring to the table a wide variety of communications options. Depending on your IP-PBX and your ITSP you could potentially look forward to HD (High Defenition) Voice and potentially HD Video.
HD voice (and video) for small business in Canada will happen, it’s only a matter of time. As broadband providers increase upstream bandwidth and dual WAN link-failover devices become common place, SIP trunking will accellerate in growth and on-net (calls made on the ITSP network) HD Voice will become common place.
Unfortunately, HD communication off-net (eg. PSTN) is not going anywhere at any great speed. Jeff Pulver is back as he reboots the communications industry with his new HD Communication Summit. I welcome Jeff back with open arms, if anyone can convince operators to increase speed towards wide-band/HD adoption it would Jeff Pulver.
Today we can see SIP trunking providers and hosted pbx providers supporting wideband codecs and devices on their networks. This will allow user to communicate in high definition with other users that have devices that support it, in brief you could have better calls between you and your colleagues in the office and remote office workers connected to the same PBX, and that is a step in the right direction.
I will admit, this is a bit of a silly comparison but the truth is that I have had a few customers (and some analysts) asking for some clarification on the new Google Voice offer and how it may compete with Response Point when coupled with an ITSP. The fact is they really do not compete in any measurable way and they could easily compliment each other.
The obvious major difference is that Response Point is a small business phone system, Google Voice is really a service offering targeted at individuals.
When we combine Response Point with an ITSP (Internet Telephony Service Provider) we start seeing some similarities in the services between the two offers but they are really meant for 2 distinctly different purposes.
Response Point offers an actual premise-based system with a base unit, handsets and features like; auto-receptionist, DID integration, hunt groups, voice mail to email integration etc. All of the things one would expect when purchasing a small business phone system.
Google Voice service is an overlay service on whatever you have today, so if your existing phone system is simply not cutting it, it’s unlikely that Google Voice is going to be able to transform it into the system of your dreams. It’s true that Google Voice will allow you to take advantage of certain features but don’t expect to find a Park, Hold or Transfer or anything fancy like speech recognition.
Google Voice is an inbound-centric service. Most features can only be used with an inbound call, that includes call recording and call joining.
How they play nice together
One could use the Google Voice – simulring feature to call your Response Point phone number and at the same time it could call your mobile.
Google Voice – call recording is a handy feature that is currently not a feature offered in the Response Point system.
Google Voice – voice mail transcriptions is a handy way to receive visual voice mails via email and SMS.
Google Voice – call widgets allow users to put callback widgets on a website. This will allow the visitor to put in their phone number and the system will call them and then it will call your Google Voice number.
Google Voice – SMS is a cool way to compose, accept and manage text messages while maintaining control over the devices associated with that service.
The Google Voice service is only available in the US. Even US subscribers can only forward/simring their Google Voice numbers to other US numbers but that is likely to change to include international countries in the near future.
In theory, the Google Voice call should go wherever the media is sent. Call Routing results may vary depending on the Response Point ITSP you choose.
When calling out, your existing phone number (Caller ID) will be presented to the callee unless you use the dial-out feature, which is (IMHO) a bit of a hassle. This causes some problems as most of us are used to calling people back on the number we last saw from them. Fortunately, many ITSPs (unlike the conventional phone companies) will allow you to change your Caller ID number to match your Google Voice number.
Google Voice does not address LNP (Local Number Portability) at all right now. Which means you can not bring your existing numbers to Google Voice, you have to choose a new number.