These can be a real hurdle when setting up VoIP, help others by posting your configs, tips and tricks or simply ask others for help if you're stuck.

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By WelshPaul
#239
There are numerous factors that may impact your VoIP call success and quality. Factors that tend to have the greatest impact on your VoIP calls are:
  • Internet Speed/Quality
  • Codec's
  • NAT-Router Traversal
  • Firewall Traversal and Port Blocking
  • Local Network Congestion
  • QOS - Quality of Service
In reality, these are all complex subjects, so I will only be approaching it from the layman's point of view, as an introduction to the issues.

In the upcoming posts, I will expand a bit on these topics.
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By kaiuk
#1227
For me it is Local Network Congestion that seems to cause problems. I have an issue because I didn't have enough PoE switches so i had to daisy chain one to a regular LAN switch. As this isn't a fibre linked switch or one that is directly networked to the core it means it is fighting with other traffic.

When possible, I need to run another cable from this PoE switch back to one of the main switches rather than just linking it to the nearest one. This should eliminate all that background noise when network traffic is high.
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