What is SIP ALG?

SIP ALG (Application Layer Gateway) is a feature included in some routers and firewalls. It's intended to help with NAT traversal (allowing devices behind a router to communicate with the outside internet). Why SIP ALG is problematic for VoIP Although well-intentioned, SIP ALG implementations on many routers are flawed. They attempt to modify SIP (Session Initiation Protocol) packets, which are essential for setting up and managing VoIP calls.  This modification by SIP ALG often breaks core VoIP functionality, leading to issues such as: One-way audio (you can hear but not be heard, or vice-versa) Dropped calls Registration problems (phones unable to connect to the VoIP service) Inability to call certain...

How to Beat the Top 5 VoIP Problems Without Tech Support

It's easy to spot and troubleshoot the most common VoIP problems you'll have without the support of tech professionals. Next time, before you reach for your phone and call the technical support services, first try these common ways to correct your VoIP services, which could save you time and money. (more…)

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Avoid Frustrating VoIP Problems With These Remedies

Did you know that your firewall may actually be a hindrance to clear, quality voice calls? You need both to run a business today. Without a firewall, you can’t protect your network, data and apps. Without high-caliber cloud or hosted VoIP service, you can’t communicate with colleagues and customers. When you think about it, it’s a bit like a dog chasing his tail. One of the primary reasons you have a firewall is to make sure calls get through safely and securely. Now it turns out that it can be the cause of calls that end up with one-way audio or are dropped altogether. VoIP technology for cloud and hosted services use SIP, or Session Initiated Protocol, to provide reliable, high-quality communications. To make...

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