asterisk users - Feb 2006 - arris e-mta

Hi

This may be off topic because it involve cable.

I am testing with Arris cable modem / MTA

I have 2 models, one older and one newer.

With older one, everything works fine

With the new one, I can register, make a call and I hear the other person 
but he can't hear me

The config is the same with both units except for the username of course,

Anybody ever worked with these units ?

Our CMTS is a uBR7246VXR from Cisco

Thanks

Patrick