VOIP problems (QOS ??)

[lraty]

Hi everyone,

I have a problem with voip calls. Here is my customer config :

- Avaya server Ed R9.1 SP4 (130 96xx IP phones, some SIP phones, 4 softphones), hosted as a VM on a DELL Poweredge R620 (VMWare esxi 5.5). There is no ethernet adaptator dedicated to this VM.
- Switch ERS 3500 (3 switches, no stack) R5.3
- A routeur provides a 25 channels trunk SIP

ERS switches were configure with the command "run ipoffice verbose). I have one VLAN Voice (42) and one VLAN DATA (40). DSCP 46 is configure on the routeur and Ip office.
My router is tagged on VLAN 42 only, my VM too (for LAN1).

My problem is the quality of incoming calls is very bad (miss words, echo etc...). It seems like QOS problems.

Should I activate ADAC and AQA on ERS switches ?
If someone have some ideas ....

[zakabog]

Sounds like it's an issue with your SIP trunks, what kind of ISP do you have the SIP trunk riding over (cable, fiber, DSL) and how much bandwidth do you have? You can do a quick test with internal calls, if internal calls sound find then there's no issue with your local QoS, and QoS does not work over the public internet.

[lraty]

Thanks for your answer

Trunk SIP is provided by a local provider.
It's riding over an optic fiber. Bandwith is 2 MB in both way.

I will execute this test but in call status, sometimes, I see a call between 2 IP phones and there is 99% of packets loss. In addition to, some calls between Ip office and a phone have jitters over 20 ms.
I attach a call status document to this tread (in french).

[zakabog]

Is that 2MB dedicated purely for voice or are you also using it for data? It looks like you're having major troubles on your LAN if that information from System Status is correct. I see from your original post that you don't have a stack, how are you 3 switches connected currently? If you look at the port statistics on these switches do you see a lot of dropped packets? Or a lot more packet traffic than what you'd expect on the network?

[lraty]

HI,

It is a 2 Mb dedicated for voice. But, on the same fiber link, there is 8 Mb dedicated to Internet traffic, not on the same VLAN).
The first switch is connected to the second with a RJ45 cable and with a Gbic to the third.

On the Gbic port I see some FCSErrors et Frame too long errors. I think I should configure the MTU but I don't find the menu..... It should be in "edit/chassis/chassis menu".

I asked my customer for a paquet loss case , it seems to happen when someone transfer a call.

Thanks for your help.