Bandwidth Question (MPLS)

[mjwilson12379]

Have a question related to useable bandwidth and priority queuing as it relates to voip traffic and, more importantly, voicemail.

Our VM servers is at our colo facility (8MB MPLS and 8MB internet pipe). Voice seems to be fine even during heavy Internet useage times (1.5MB MPLS pipe from each of 4 locations to the colo). But VM is not. This can be garbled and have jitter. Does anyone know (without me grabbing a packet sniffer) if the VM traffic is sent as VOIP traffic or just regular data? It runs over the IP Trunk group, so I would suspect it to be voip.

Thanks,
MW

 

[dizzyphil]

In your lines tree, open the voip line between the two locations and make sure on the voip tab that 'out of band DTMF' is ticked. I had that problem and doing this solved my jitter problem.

Dizzy

 

[mjwilson12379]

Yup, its checked.

 

[IPGuru]

VM is sent using an Avaya Proprietory format
it is highly likly that ther is no Qos signaling provided on this data
is ther any reason why the VM canot be located locat to the system (or is it a centralised VM serveron another IPO)

 

[mjwilson12379]

Awesome!

Yes, this is a central server hosting VM for 6 sites currently. No real way to do traffic shaping over MPLS.

 

[SuperJenks]

I Have the same problem at a 3 site scn w/ centralized vmail. Calls accross point to point are crystal clear but calls to vmail are garbeled and unclear. Technically, a call going to the vmail server is still a VoIP call because the voice dignal is broken down into segments and sent out via a packet with a IP destination. The only difference between a actual VoIP call and a call to the vmail is Compression of the packets. A voip call from phone to phone over the network obviously uses a vcm channel where making a call to vmail locally doesnt. That is most likely the difference we are hearing in the quality difference. Not sure if there will be any solution to this as this is just the way it is, and how it works.

 

[ThePhoneMn]

A good test would be to setup a phantom user at the site w/ the voice mail, configure a VM Pro "leave" for this user and have a Get Mail action from the Start Point. Just a guess, but the call would probably use the VCM to call the user, then you can login to voicemail through this users "leave" action.