SA 520 - Poor VoIP

Unanswered Question
Mar 23rd, 2010
User Badges:


I have a SA 520W which is working (mostly) fine.

We are using VoIP with about 10 handsets, and whilst the SA520 is operating as the office gateway we get quite poor call quailty. (Replacing with a basic RV042 the problem goes away.)

I suspect I've just missed a part of the config, especially to do with the QoS.

We have dual WAN, set to load balance with protocol bindings.

I've configured the SIP-TCP/SIP-UTP services to be bound to one of the WAN interfaces, I've configured the firewall rule to ensure tha the SIP-TCP/SIP-DP traffic is "QoS Priorty: Minimize Delay". But I dont get any joy.

The phones are also on their own VLAN.

Does anyone have some suggestions on what I can do to try resolve the problem?

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
mark-9898 Wed, 03/24/2010 - 16:39
User Badges:

No suggestions? Nothing else to even attempt?

Does my setup sound valid or incorrect?

paolo bevilacqua Wed, 03/24/2010 - 16:49
User Badges:
  • Super Gold, 25000 points or more
  • Hall of Fame,

    Founding Member

Do you want an honest advice without entering in details ?

Replace that for a true IOS router, eg 87x.

marcoarndt Tue, 10/19/2010 - 05:12
User Badges:

I have the same problem whit the sa 520w. We have round about 20 VoIP Phones, and whit an other (Home) Router it works. I can´t understand why there is special QoS part in the web interface.

Pasadena01 Mon, 03/14/2011 - 02:43
User Badges:

Hi Marco,

Found a solution? I have the same problem, QoS semms not to work, VoIP Phone ist jittering.

I use the Firmware 2.1.8, problem ist still there.

Or what do we make wrong?



This Discussion