background image

Put Comrex On The Line.

Toll Free in USA: 800-237-1776 • www.comrex.com 

e-mail: [email protected]

19 Pine Road, Devens, MA 01434 USA  

Tel: +1-978-784-1776 • Fax: +1-978-784-1717

Sangoma s206: A Cheap Desktop VoIP Phone That 
Makes Opus Calls to Comrex Codecs

Introduction

Hacking around with VoIP hardware is a fun thing 
for us at Comrex. Recently, we noticed the Sangoma 
s206 for sale online at a really low price (USD $58 at 
voipsupply.com as of March, 2019) and saw that it 
offered both Opus and G.722 encoding. 

We were intrigued enough to buy one and take it for 
a spin. Within a few minutes of setting it up, we were 
making wideband calls to our ACCESS and BRIC-
Link codecs. 

We immediately recognized that this phone might 
make a good option for people who want a wired 
“batphone” on their desks to make calls via codecs.

So here’s a four-step cheat sheet on how to get it 
going.

Instructions

We didn’t bother registering the phone to a SIP 
provider, but that’s certainly possible if you want to 
call from the codec into the phone.

Out of the box, the phone connected outbound fine 
via G.722, and it only took a quick configuration 
change to make it prefer the better-sounding Opus 
encoder.

Step 1: Plug the phone into an internet connection 
that supports PoE. 

The phone doesn’t ship with a power supply, so it 
needs to get its power from the network.

Step 2: Make sure your phone is running the latest 
firmware from the Sangoma website.

The firmware that shipped with our phone didn’t 
connect correctly, so we had to update it. (Our 
working firmware update was 3.0.4.59.) You’ll need 
to access the web interface on the phone for that.

Get the DHCP IP address the phone uses by selecting 
Menu->Status->Network->IPV4. Open that address 
on a browser (user/password = admin/admin), then 
navigate to Management->Upgrade and send it 
the latest firmware file.

The phone will reboot after the upgrade. After it 
reboots, re-log into the web interface and choose 
Account->Codec. Change the entry on “Choice 3” 
to Opus. Change “Choice 4” to G.722. It should look 
like this:

Select “SaveSet” at the bottom to save the changes.

Reviews: