[Description]
Customer tried to change DNS mode to H323RS on a TE30 by typing command "h323c cfg dnsmode 2" but the DNS mode does not change.

[Handling]
We asked for TE30's software version and the customer sent us this capture:

After thorough checking, we found out that from this software version upwards, the command for changing the DNS mode has been changed and it has the following syntax:
mc cfg [H323dns] [service] [protocol]: (service: h323ls|h323cs|h323rs protocol:udp|tcp)
Therefore, customer should issue the following command to change the DNS mode to H323RS:
mc cfg H323dns h323rs udp
[Root cause]
From version V600R019C00SPC300 onwards, the "DNS mode change" command syntax has been replaced with this one:
mc cfg [H323dns] [service] [protocol]: (service: h323ls|h323cs|h323rs protocol:udp|tcp)
[Solution]
Use the command: mc cfg [H323dns] [service] [protocol]: (service: h323ls|h323cs|h323rs protocol:udp|tcp)