02-22-2018 09:47 AM - edited 03-17-2019 12:16 PM
I'm having a hard time understanding when transcoding is done on a local router rather then on a CUBE or server. I'll lay out a what happened recently and see if I can obtain answers through the scenario...
We had an employee call a cell phone and was connected but during the call it droped. We found that it was due to BGP routes going down on our MPLS but, while looking at this I discovered what I think was an issue. The callers phone was associated with a media resource group list that didn't contain transcoding configuration. Normally we have a transcoding (xcode) profile in every MRGL that is associated with the local router. In this instance the callers Device Pool was assigned a MRGL that did not have an xcode configuration for the router that would be used. I found that not only was the xcode configuration not configured within Call Manager but the DSPprofile on the router being used was shutdown. So, here comes my questions...
1. How did the call ever become connected if no transcoding was configured? Where is the transcoding being done? I assume the cell carrier was not using G729 and some sort of transcoding had to be done.
The MRGL did have an MTP assigned but it was server based and we lost connection to the servers during the downtime. If no transcoding configuration exists does MTP do the translations between codecs or do we think that the transcoding was done on the carrier CUBE router?I doubt this makes total sense but hopefully someone can help me understand.
02-22-2018 09:53 AM
02-22-2018 10:01 AM
02-22-2018 10:12 AM
02-22-2018 10:22 AM
02-22-2018 10:33 AM
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