Stefan Helander

Asterisk no sound from client

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I was running an Asterisk server behind NAT without any problems at one location. Due to reoargnization it was moved to a new location and placed behind a pfsense firewall. After a while users reported increasing problems with no sound from the clients.

It turned out running a SIP server behind a pfsense can be problematic. When moving to the SIP server to a white IP-adress (no NAT), protecting it using iptables firewall on the SIP-server, all problems disappeared.

It should be noted that the pfsense firewall was not running the latest version of pfsense so it could be caused by a problem solved in later versions of pfsense. However, for different reasons it was not possible to upgrade pfsense so the solution was to move the SIP-server from behind pfsense.

Stefan Helander

How to vertically center text in a div

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This is a neat way of centering text in a div. Live demo here.

 

<html>
<head>
 <title>Vertical text center demo</title>
</head>
<body>
<style>
.textbox {
 height: 200px;
 width: 300px;
 text-align: center;
 font-size: 14px;
 font-weight: bold;
 background-color: blue;
}
.textbox p {
 height: 100%;
 display: flex; /* vertically center text */
 justify-content: center;
 align-content: center;
 flex-direction: column;
 margin: 0 50px;
 color: white;
}
</style>
<h1>Vertical text center demo</h1>
<div class="textbox">
 <p>This text is vertically centered in the box</p>
</div>
</body>
</html>