Template fix: (Pacific DST)
Original template:
````
<option value="4" displaytext="GMT-8:00 Mexico(Tijuana,Mexicali)" id="5" zone="-8:00">
<item name="timezonename">PST_-08</item>
<item name="dstenabled">2</item>
<item name="dstoffsetminutes">60</item>
<item name="dststartmonth">3</item>
<item name="dststartweek">2</item>
<item name="dststartday">12</item>
<item name="dststarthour">2</item>
<item name="dststartmin">00</item>
<item name="dstendmonth">11</item>
<item name="dstendweek">1</item>
<item name="dstendday">5</item>
<item name="dstendhour">2</item>
<item name="dstendmin">00</item>
<item name="timezonex3s">-32</item>
<item name="timezonenamex3s">UTC-8</item>
<item name="locationx3s">
2</item>
</option>
````

You can see from the screenshot of the phones interface that the location is set to Mexico which doesn't start DST util April. By changing `<item name="locationx3s">
2</item>` to `<item name="locationx3s">
3</item>` it changes to the correct DST for North America.
In the 3CX Dashboard there is no appropriate selection for Pacific Standard Time United States.
v15.5.9348.3

Wait, but it was there in
v15.5.8801.3 :
