If you have two sites linked together with PBX tie lines and you want to try using VoIP so that calls will be routed...
over your internal network rather than costly tie lines, you can test using a SIP to PSTN gateway (such as the MX25.)
This configuration could look like this:
Existing PBX <- T1 PRI -> MX25 <- SIP over WAN network -> MX25 <- T1 PRI -> Existing PBX
Perhaps you have a single site and you want to keep your existing PBX and connect long distance calls through an Internet telephony service provider that provides superior rates. In this case, you could use a SIP to PSTN gateway and connect in this fashion:
Existing PBX <- T1 PRI -> MX25 <- SIP over Internet -> ITSP ->
Perhaps you are planning on replacing your legacy PBX and putting in an IP PBX (such as the MX250) to test the functionality before cutting over service. In this case, the configuration could look like this:
Existing PBX <- T1 PRI -> MX250 <- T1 PRI -> PSTN
Using this approach, the existing PBX continues to function as it always has and only dial plan entries are required to route calls between systems. This allows for certain employees to learn the new VoIP system and understand its features before migrating over service.
Dig Deeper on Telecommunication networking
Related Q&A from Carrie Higbie Goetz
The rules around E911 location tracking have evolved as more businesses move away from traditional wired connections to VoIP. Here's how to stay ... Continue Reading
Our expert explains the UC monitoring tools you need and the potential network problems you may discover in your UC and collaboration environments. Continue Reading
When your SIP service isn't connecting properly, process of elimination will help you determine if the issue lies in your configuration or elsewhere ... Continue Reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.