Mitel call drops one way

[kyuss2242]

First thanks in advance for any help any users can give me on this!

We have a mitel 3300 system at one of our remote branches. This connects to another 3300 system just down the road via a 3meg up/down dsl line. This second 3300 connects back to our main ISP via a 20 meg man which then connects to our HQ via a 100 meg fiber run (soon to be 1gig).

The issue we are seeing is intermittent which is making it very frustrating to troubleshoot. The users are reporting a dropped call meaning the users cannot hear the remote users at our HQ via a conference call. However the users at our HQ can still hear the users at the remote location talking. Once the call is disconnected and redialed the remote users can hear just fine.

Wiring is suspect and I have a quote to rewire the building but I would like to rule out other issues first.

Please bear with me as my knowledge of phone systems is next to nothing.

Any suggestions or troubleshooting tools would be greatly appreciated!!

Josh

 

[kyuss2242]

I forgot to mention that it almost always seems like it is a conference call that drops and typically internal users not a call to the outside world.

 

[IrwinMFletcher]

Sounds like a maybe a port blocking problem. Note there is a difference in who initiates the conference (remote or main site user) as to where the conference is created (on which controller) and then the streaming must be able to get to that controller.

 

[kyuss2242]

I talked to a co-worker and I guess it has happened a few times to users not on a conf call. I can not get reliable data on if they are in an internal or outside call. i.e. calling hq or calling out to the world.

I would think a port problem would be a static issue rather than intermittent but I could very well be wrong on how the voip works. Does the Mitel system dynamically grab ports?

I have also thought that perhaps an issue with a routing protocol at our HQ side routing traffic back to the remote site.

As I am running this through my head the 2nd Mitel system at the remote site just down the road (school), never has an issue and that is a call center.... So I would think it is either the mitel unit at the plant (place where issues are occurring) or the switch at the school pushing traffic back to the plant.

Irwin, good point on the initiation, I will look into that. Thanks!!