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The LERG: Telecoms heaven for data nerds

March 25, 2022 By Andrew

The LERG: Telecoms heaven for data nerds

When I was a kid my favorite sport was cricket. (Actually that’s still true.) I found cricket particularly appealing because it was chock-full of numbers. I could (and can) tell you that Don Bradman’s test batting average is 99.94, or that the highest score by an Englishman was Len Hutton’s 364 at the Oval in… Continue Reading

Metaswitch SP4100 CPU cards – do you need spares?

April 23, 2021 By Andrew

A couple of years ago I wrote an article warning people about some quirks in the way the Metaswitch CPU cards from the VP2510/VP3510 era worked. I’m writing an update today to share some details of a new service we’ve developed for those using these cards. As a refresher, the key points from the previous… Continue Reading

3CX and Metaswitch SIP configuration guide

February 16, 2021 By Andrew

3CX and Metaswitch SIP configuration guide

As I write this in 2021, you would think that SIP interoperability would be a solved problem, but sadly that’s not the case. In this document we’ll be sharing the configuration we’ve used to build a SIP trunk between a Metaswitch and a 3CX PBX. As an aside, we decided to experiment with a virtual… Continue Reading

988 Suicide Hotline and 7D local dialing

January 21, 2021 By Andrew

In October 2020 President Trump signed the Suicide Hotline Act, putting into law a plan the FCC already had in motion to designate 988 as a nationwide phone number for a national suicide prevention and mental health crisis hotline. I wrote briefly about this when the FCC first proposed the idea, and concluded that this… Continue Reading

5 translations best practices for a reliable network

August 28, 2020 By Andrew

How often do you have to update your switch translations or routing? Among our clients this varies from “every week” to “once or twice a year” – and every time a change is made there’s a risk of impacting service. With any network wide change you need to strike a balance between operating efficiently and… Continue Reading

Dynamic Peer Routing in the Perimeta SBC

June 18, 2020 By Andrew

Perimeta has a feature named dynamic peer routing which allows the Perimeta to automatically select the correct adjacency for an outbound call based on the destination IP address. Before this existed, you needed to update the call policy set every time you add a new PBX / SIP trunk, which could become tiresome really quickly…. Continue Reading

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