With my reseller we found a configuration that change.
We try on INTERNET that the probloem is RTP packet.
By default on Linksys adapter (analog) and CISCO WIP 310 is 0,030, on linksys adapter when we change with 0,020 the audio funztion "full duplex", i suppose the problem on outside line (not line SIP) is latency froma devices between NBX to tep card PRI or BRI.
After i try on CISCO where the parameter show the same and after write down here the result.