Cross connected calls over MPLS WAN

[psmith]

Hi,

I have an issue with one of my offices that has me extremely puzzled.

When users call users in other offices, sometimes the calls get cross-connected, where they are suddenly talking to another caller.

Our telephony provider is insisting it is my network, but I have this office router and switches configured the same as our other 5 offices that don't have this issue.

They are now trying to say it is an MPLS issue from our Telco, but I figure I would be seeing issues with data going over that link as well.

Has anyone ever experience this "crosstalk" before?

The routers at the offices are 2811/2851, with 10meg MPLS WAN between, and 3560/3750 PoE switches for the phones.

Any advice or tips would be greatly appreciated!

[paolo bevilacqua]

Unlikely is the transport. What IOS on the router,m which protocol are to CCM, and which version is it ?

[psmith]

The 2851 at our head office is running 12.3(8)T8.

The 2821 at the remote office is running 12.3(8)T8 as well.

We are not using CCM, we are using a Mitel VoIP solution (which I hate and wanted to go with Cisco instead!), which is using Minet (shows as RTP traffic).

[paolo bevilacqua]

And what you are using for phones ?

Because, if there is no cisco voice devices involved, I'm afraid you have to seek support from Mitel.

[psmith]

I already know it has to be a Mitel problem. But since the network is my responsibility (not voice), I wanted to try to rule out that it couldn't be my 'fault' it is happening.

[paolo bevilacqua]

No, do not worry. I think your cisco routers and switches are behaving well as they do most of the time.

[rgoodwin7399]

Were you ever able to get this resolved? I have a similar issue at two branches that are using CCM. I think it is a router ios issue and was wondering if you ever got anywhere with it.

[russell.turner]

I curious if you found a solution to this issue. I have Mitel voip network but I have not encountered this.