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InternetVoipPhone Blog

A Blog About Internet VOIP Phones

  • Convert WAV File For 3CX Phone System

    In order to add an audio file to 3CX Phone System you will need to convert it to a particular WAV format.

    The easiest way to do this is to download a free audio conversion tool called Sox, download it from here - https://sourceforge.net/projects/sox/files/sox/

    Once you have installed the Sox audio conversion tool, locate it in your file system, which will most that likely be c:\Program Files (x86)\sox-14-4-2\

    Now, open a command prompt, and browse to the Sox folder, by using the cd command.

    And enter the following command.

    Continue Reading

  • Upgrade 3CX V12.5 to 3CX V14

    Having recently upgraded our 3CX V12.5 to 3CX V14, we'd like to share our experience

    It is important to note that you should fully update your existing 3CX 12.5 edition as there is a service pack that prepares V12.5 for the V14 upgrade

    If you are using IIS and have a third party trusted certificate, it is also important that you export your SSL Certificate to a .pfx file (We'll come back to this later) Continue Reading

  • Important changes to 084, 087, 118 or 080* numbers

    Important changes for customers who own or dial telephone numbers starting 084*, 087*, 118*** or 080*

    In order to simplify call costs for consumers, the telecoms regulator Ofcom is changing the way numbers starting 08, 09 and 118 are charged for. The changes will take effect from 1st July 2015 and are as follows:

    Continue Reading

  • Turn Off SIP ALG On Zyxel P 600 Series Router

    In order to turn off the SIP ALG on Zyxel P 600 Series Routers you will need to telnet on to your router Continue Reading

  • SIP ALG Workaround For Virgin Media Superhub

    The Virigin Media Superhub does not have the ability to turn off SIP ALG, this can cause a number of problems if you are trying to use a VoIP telephone system Continue Reading

  • Hot Desking Using Snom Phones & 3CX

    Hot desking is the concept of logging onto a phone and your extension number following you

    This is very effective when desks are not 'owner occupied'.  Examples of scenarios where you might find hot desking useful might include when staff work from multiple offices/homes or maybe you have shift workers like call centre staff Continue Reading

  • Call delay when making a call from Gigaset DECT handset

    We recently encountered a problem when a caller was explaining that when they made a call, the called handset was picking up the call but there was a 2-3 second delay before the caller heard the pickup and consequently the receiving party was left saying 'hello', 'hello', 'hello'..... before the caller heard any audio

    Continue Reading

  • How to disable SIP ALG on Thompson Technicolor Routers

    By default many Thompson routers have a SIP ALG enabled.  SIP ALG in most scenarios is damaging to voice over IP, often resulting in one way audio Continue Reading

  • Cannot Register Snom Phone On 3CX

    We recently experienced a problem trying to register a Snom 710 phone to a 3CX server.  Whatever we did the phone refused to register.  The phone appeared within the Phones console via PNP but couldn't be automatically or manually provisioned

    We eventually determined that the problem was related to the client using a public ip addressing scheme for their internal network.  In this instance the LAN was 199.x.x.x

    There were two tasks required to resolve this issue:

    1. The IP address of the phone was listed in the IP Blacklist within Security section of the Settings of the 3CX console.  The IP address needed to be removed

    2. Most notably we had to untick the attribute 'Disable use of extension outside the LAN' on the Other tab of the Extension Details

    A bit of a 'gotcha' which won't be missed again!

  • Unlimited Horizon - Draytek 2820 Router

    The main issue with the Unlimted Horizon service on the Draytek 2820 Router is UDP fragmentation this can cause issues with DNS resiliency. The following solutions are recommended:

    1. 1. Download the latest firmware from Draytek which should contain a patch to solve the problem with UDP fragmentation
    2. 2. Specify the DNS servers in the Draytek LAN Config to a 3rd party DNS server such as Google (8.8.8.8)

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