A question that We get a lot is how can I get info on what I am buying prior to purchasing ? How does this work with other equipment that we have already ? At rpoctelecom , We make sure you have the latest and up to date info so that when you make your purchase you know everything about what you are buying ! On Telephony Gateways , Session Border Controllers , IP Paging , Headsets and add ons and more , We have the latest datasheets available for every product that we sell . Unfortunately our website does not allow us to publish ALL of them . Just send us a message and we will be more than glad to give you any and all information that We have on the product ! Telephones are pretty simple as in a nice display or an entry level , how many buttons , how many sip accounts etc. Most SIP telephones today work on standards that are set and a lot of the Manufacturers adhere to them pretty well ! However , some of the newer small and medium Business Systems have issues with button programming etc. That we can assist on ! When buying a SIP based telephone today , make sure that the system you are attaching to has a template for Your telephone in order to program the correct buttons ! This is very important as to what type of buttons you can put on your telephone and if they will actually operate with the correct feature with your system ! Example a Yealink telephone with a Sangoma system . There are many other systems like Grandstream as well so just make sure to be aware and ask the questions ! Also , ask and you shall receive ! If we do not have that info , we can get it for you !! Most other equipment like Gateways , Session Border Controllers , Paging Equipment require a little bit of planning in the same sense as in Digital or SIP Telephone lines , Analog Paging or IP Paging , The type of circuits you need to purchase a gateway for or the type of traffic you need to resolve in your session Border Controller as well ! So if you are not syur e, reach out and call as we can help in most installations today by giving you the most up to date information thus equipping you with the knowledge to make the correct financial decisions ! Our Website today is not set up to store all of the technical information available but in the future this is one of the improvements that we are working on ! Also We constantly are reviewing Our Store to serve You rapidly and efficiently and cost effectively as well as we are constantly upgrading !