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Burner Phones
This
is not an Asterisk related post but an example of telephony in popular
media as opposed to the reality of pay-your-way phones as secure
communications devices.
By John
Johnson 11/5/2019
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Making Yealink
T42g Custom Ringtones
One of the things modern SIP phones allow you to do is add your own
ringtones rather like you do on your smart phone. Today I figured out how
to do this on a Yealink T42g phone. I haven’t
tried it on any other Yealink models (and that’s
my disclaimer right there) but this does work on the T42 and I would think
it probably would on the rest of the T4x series. It’s pretty great, now I
have the Three Stooges singing “Hello, Hello, Hello” in harmony when calls
come in and that makes it totally worth the time spent to figure this out.
By John Johnson 1/8/2016
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AT&T IP Flex implementation
Several
years ago I did my first Asterisk/AT&T IP Flex implementation and it was
pretty challenging. At that time I did a little write up for the community
at large, basically a “how-to” Since that time I have done eight more
implementations of this VOIP/SIP service and thought it was time to
re-visit that how-to with some updated information/experience.
By John Johnson 11/22/2015
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Get email
notification when Asterisk reloads or reboots
As you
build a population of Asterisk systems in the field it can be important to
know when those systems reboot, are power-cycled or when the “safe_asterisk” script finds it necessary to restart
Asterisk (without rebooting the server). Follow these instructions to get
those email notifications.
By John Johnson 12/18/2014
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Implementing the Algo 8180 SIP Audio Alerter
“IP Loud Ringer, SIP
Speaker, & Voice Paging Device”
I recently installed one of these in a public
school and found it to be a great addition to an Asterisk based phone
system. I was looking for a “Loud Ringer” to be used in the kitchen and not
having any FXS ports off this system or wanting run wiring from the phone
set in the office to some aftermarket ringer, I went looking for a SIP
based device and found the Algo 8180. With its
advertised paging and two-way talkback functions I thought it might make a
good addition to our stable of Asterisk phone system components going
forward. ~MORE~
By John Johnson 2/20/2014
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Instructions
are for adding Hylafax Modems to a PIAF Incredible PBX with
existing fax modems
2/17/2014
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Install
Open Source g729 codec on Asterisk
By
John Johnson 1/31/2014
I recently found it necessary to add
g729 to an Asterisk system to allow it to place calls to another VOIP
system that only used g729. Both parties were SIP connected to the
same VSP but could not connect calls to one another in that the carrier did
not provide any translation. The Asterisk system I was supporting used g711
(both ulaw and alaw)
with ulaw first by default. The following is how
I added g729 allowing calls between the two.
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Call Flow
Multi-Toggle
Often
in more complex Asterisk implementations you will find yourself creating
multiple inbound routes that require “Call Flow Control” or “Day/Night Control”
toggles. A company that has different DID routes for different departments
that are similar in structure but have different call flows might have
three or more Call Flow toggles to
put the system into “Holiday” or “Night” mode. Requiring someone to dial three separate codes to “flip” the system
into Holiday or Night mode and again three codes to set it back when
business resumes could be pretty cumbersome. The following is some dial
plan code to create a single code to toggle multiple call flow instances. 10/1/2013
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One-Touch
Voicemail
With
this feature added to your Asterisk server, the voicemail password prompt
will be skipped when dialing *97 directly from the extension. A password is
still required when accessing a voicemail account remotely via *98. Users
like this feature, and it is particularly convenient in the Hospitality
industry for hotel/motel room phones.
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Using an external sound source
(i.e. Muzak) for
MOH via the sound card in your Asterisk server. This is a standard feature on most traditional telephone
systems, so I think it should be a standard offering for an Asterisk based
system too.
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How to: Send an emailed alert message
whenever 911 is dialed from your Asterisk VOIP PBX. As
more business add an emphasis on safety within their operation this can be
an important tool.
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Using the sound card in your
Asterisk server as a paging output (provides real-time paging, no “delay”).
While there are plenty of IP
attached paging units out there, if your Asterisk server has a sound card,
why not use it and save the expense of the external module?
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Cisco 79xx Asterisk
Setup
Having
rolled out an asterisk implementation re-purposing over forty Cisco 7941
and 7961 phones, I wanted to share my experience to hopefully save some
other technicians some grief.
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Fix calls on hold
dropping
On some Asterisk systems there will be a
consistent problem with calls placed on hold by SIP phones dropping at a
set interval.
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