1. CHOPPY VOICE AUDIO
Choppy audio refers to audio that cuts in and out, making it difficult
to understand the speaker. This can be due to various reasons:
CAUSES & SOLUTIONS:
A. NETWORK CONGESTION:
Symptom: Other network activities, like file downl...
DETERMINE THE EXTENT OF THE PROBLEM
COMMON SYMPTOMS: Cannot make calls, phones do not dial out, offline or
exclamation mark icon on the phone screen
QUESTION: Are you experiencing issues with a single phone or all
phones?
FOR A SINGLE PHONE ISSUE:
...
KNOWN ISSUES
1. SIP ALG will cause problems if it's enabled, but it can be disabled
on at least one of the firmware versions.
2. MTU is set to Auto by default, which can set it to 576, which is
too low. This will cause intermittent phone feature failu...
YOU CAN VERIFY IF YOUR ROUTER IS SIP ALG ENABLED BY DOWNLOADING AND
RUNNING OUR SIP ALG TESTER PROGRAM
SIP ALG Tester [https://vantact.com/downloads/SIP-ALG-Tester.exe]
Download
STEP 1: CREATE A “STATIC NAT (SNAT)”
First, the Static NAT must be conf...
You can verify if your router is SIP ALG ENABLED by downloading and
running our SIP ALG TESTER Program
SIP ALG Tester Download
[https://vantact.com/downloads/SIP-ALG-Tester.exe]
SIP ALG is located in (via the web interface):
Go to Advanced Settings ...
SIP ALG EXPLAINED - TECHNICAL
Many of today's commercial routers implement SIP ALG
(Application-level gateway), this feature is almost always enabled by
default. Many of the brand such as Cisco, Netgear, D-Link, Mikrotik...
While ALG could help in solvi...
SIP ALG EXPLAINED - TECHNICAL
Many of today's commercial routers implement SIP ALG
(Application-level gateway), this feature is almost always enabled by
default. Many of the brand such as Cisco, Netgear, D-Link, Mikrotik...
While ALG could help in solvi...
YOU CAN VERIFY IF YOUR ROUTER IS SIP ALG ENABLED BY DOWNLOADING AND
RUNNING OUR SIP ALG TESTER PROGRAM
SIP ALG Tester Download
[https://vantact.com/downloads/SIP-ALG-Tester.exe]
ASUS ROUTERS
Disable the option SIP Passthrough under Advanced Settings...
You can reset the following models using the keypad on the phone.
MODELS APPLICABLE: Grandstream GXP2130, GXP2135, GXP2140, GXP2160,
GXP2170
Here you can see how to Factory reset Grandstream Phones
* Press the menu button (center button of the dir...
APPLIES TO YEALINK HANDSETS: W53H, W56H, W59R
APPLIES TO YEALINK BASE: W60B, W80B
EASY REGISTRATION
1. When the handset LCD screen prompts "Press base paging 2s then
press Reg.", long-press the Wireless button User-added image on the
base station un...
FIREWALL/NAT SETTINGS
The firewall or NAT (Network Address Translation) settings could be
causing the phones to lose their registrations.
DIAGNOSIS: Check the firewall and NAT settings at the remote
locations.
RESOLUTION: If this is the problem, cha...
In order to factory reset a Snom 300 or 320 via the phone interface,
go through the following steps below:
Press "Navigation" down to enter the "Settings" or the wrench icon
menu.
Scroll down to "Configuration".
Press "Confirm" button.
Scroll down...
If you need to reset your phone to factory settings, please follow
this procedure:
* Press "Settings" [Screw driver] button to enter the "Settings"
menu.
* Scroll down to "Configuration".
* Press "Confirm" button.
* Scroll down to "Reset".
* P...
ROGERS, SHAW, and several other cable internet service providers are
deploying a new gateway/modem/router combo, the HITRON CODA-4582U.
The new gateway is known to cause the following issues when used with
VoIP and SIP based providers.
* LOSS OF REG...
The issue when a phone is stuck on Sending DHCP requests means that
the phone is unable to receive an IP address from your router.
First of all, make sure the Internet cable is connected to the NET
port on the back of the phone. Connecting it to the PC ...
WHAT ARE SIP ALGS?
SIP ALG stands for Session Initiation Protocol Application Layer
Gateway. Most routers and modem-router gateways have these enabled by
default. SIP ALGs interfere with SIP packets, modifies them, and send
them to your provider. In our ...