VoIP calls dropping out

[newpersn]

Have a Panasonic phone system at a site and having problems with calls dropping out externally.

 

Backbone of the network is on 10gbs links. Phone system is meant to be on its vlan but it’s all over the place. (Some phones have pcs plugged in on the back which can’t be helped due to lack of network sockets). All switches are HP 2920-48g POE+. They are some small 10/100 dumb switches around but hoping they will get removed

 

Our PBX support has checked the logs but faults fine

 

Also our SIP provider has checked and no errors found.

 

The internet connection is Virgin media 1gb up and down. Have logged a case but they claim they can’t find a fault. And as there no VoIP service with them there not interested it feels.

 

Where to start?

[Meldrew]

Is there any pattern to when the calls drop out? Can you link the drop out to high usage on your broadband, although with a 1Gb connection it should be fine. When you say they drop out, does the call end completely, or do you just lose audio for a while, then it returns? For both parties?

 

Meldrew

[FN-GM]

Is it just external calls that are impacted or internal as well?

[newpersn]

Is there any pattern to when the calls drop out? Can you link the drop out to high usage on your broadband, although with a 1Gb connection it should be fine. When you say they drop out, does the call end completely, or do you just lose audio for a while, then it returns? For both parties?

 

Meldrew

 

I don’t know if I can link the 2 together. I can’t see anyone maxing the connection out. There is a Sophos web filter which tells me about usage. I’ll have a look. And I’ll check the firewall.

 

Calls drop for both. Loose audio and doesn’t come back.

[Davit2005]

Have a Panasonic phone system at a site and having problems with calls dropping out externally.

 

Backbone of the network is on 10gbs links. Phone system is meant to be on its vlan but it’s all over the place. (Some phones have pcs plugged in on the back which can’t be helped due to lack of network sockets). All switches are HP 2920-48g POE+. They are some small 10/100 dumb switches around but hoping they will get removed

 

Our PBX support has checked the logs but faults fine

 

Also our SIP provider has checked and no errors found.

 

The internet connection is Virgin media 1gb up and down. Have logged a case but they claim they can’t find a fault. And as there no VoIP service with them there not interested it feels.

 

Where to start?

 

You can't do much about the dumb switches apart from remove them but where you have PCs plugged into switches you should be able to tagg the voice vlan to the phone and untagg the data therefore only needing one network port. Voip can be prone to interference from noisy NICs, printers etc. and you really want to seperate this out as you are probably aware.

 

What firewall/router do you use by the way, anychance this area could be investigated, is it leased line from VM?

[newpersn]

You can't do much about the dumb switches apart from remove them but where you have PCs plugged into switches you should be able to tagg the voice vlan to the phone and untagg the data therefore only needing one network port. Voip can be prone to interference from noisy NICs, printers etc. and you really want to seperate this out as you are probably aware.

 

What firewall/router do you use by the way, anychance this area could be investigated, is it leased line from VM?

 

Our plan is to get rid of of one dumb switch from an office. And have the phones on the right vlan.

 

I will read in to ip phones and tagging and un tagging of the port.

 

I think it’s a Leased line from VM. I will check router and firewall tomorrow when I’m on site.

[gh5000]

I've got the instructions hidden away somewhere for setting up vlans on Panasonic phones if you need.

 

We had (rarely have now thankfully) the same issues with our Panasonic system. Our main effect was that an external calls wouldnt be able to hear us, but we could here them.

 

When we were having the major problems it was due to a bug in NetSupportDNA when it did it's autodiscovery every 15 minutes. The broadcast traffic would knock everything out.

 

Advice would be to have a think about what on your network might be firing out lots of broadcasts. And plan to put the system on a vlan this summer like I plan to.

[newpersn]

I've got the instructions hidden away somewhere for setting up vlans on Panasonic phones if you need.

 

We had (rarely have now thankfully) the same issues with our Panasonic system. Our main effect was that an external calls wouldnt be able to hear us, but we could here them.

 

When we were having the major problems it was due to a bug in NetSupportDNA when it did it's autodiscovery every 15 minutes. The broadcast traffic would knock everything out.

 

Advice would be to have a think about what on your network might be firing out lots of broadcasts. And plan to put the system on a vlan this summer like I plan to.

 

i'm going to try and get most of the phones on its own vlan. If you could find the instructions for Panasonic phones that would be a big help

 

I'll have a poke around to see what could be sending broadcast traffic out. I dont think they have much.

[markwilfan]

I had random drop outs a while back. Spent weeks troubleshooting things with external company. Rebooted core switch one night and issues disappeared #facepalm

[FN-GM]

I had random drop outs a while back. Spent weeks troubleshooting things with external company. Rebooted core switch one night and issues disappeared #facepalm

 

If I was you I would upgrade the software on that switch.

[markwilfan]

If I was you I would upgrade the software on that switch.

 

Luckily we think the same already at K.16.02.0022m which is the highest a HP5412 will take. Been working fine for months now

[newpersn]

I might try that on the core switch. Scared in case of something goes wrong. But I’ll try it.