AT&T Flexible Reach with a Grandstream UCM
I blogged in 2019 about connecting 3CX running on Windows with an AT&T Flexible Reach SIP gateway. Now I’m moving that customer to a Grandstream UCM6301, currently running firmware 1.0.21.9, …
I blogged in 2019 about connecting 3CX running on Windows with an AT&T Flexible Reach SIP gateway. Now I’m moving that customer to a Grandstream UCM6301, currently running firmware 1.0.21.9, …
Internet Telephony provider VoIP.ms has been the subject of a Distributed Denial of Service (DDoS) attack for several days. The attack has knocked most of their services offline, including phone, …
I’ve recently completed setting up AT&T IP Flexible Reach service for use with an on-premises installation of the 3CX phone system. The AT&T process is quite opaque, so I wanted …
Last week I disabled SIP ALG (or “SIP Conntrack”) on my UniFi USG router: Today I noticed that one of the accounts on my Yealink T42G phone was unregistered. My …
I am running 3CX 14 stand-alone on a cloud-based server with a fixed IP. At my location, I have installed the Session Border Controller (SBC), also v14, on a local …
If you want to provision unsupported phones to use with 3CX, you may come across this article on the 3CX web site: Provisioning unsupported IP phones. It looks quite helpful …
As mentioned in the previous post, getting endpoints to apply QoS tagging is only half the battle. We also need the PBX to apply tagging on outbound packets.
I recently purchased a Cisco SG 200-26 gigabit switch to upgrade the office infrastructure. This is a “lightly-managed” switch with a web interface. Here’s what I’ve learned so far about …
Back in November 2008, I blogged about Setting Up PBX in a Flash, Part 1: Configuring a Virtual Machine. That article discussed running PBX in a Flash (PiaF) under Microsoft …
No DTMF I’m setting up a new PBX in a Flash (PiaF) machine running Asterisk 1.4.21.2. I’m testing it by calling in with SJPhone across a VPN (the PiaF machine …