[SR-Users] nat_uac_test mode parameter 16

[Andrew O. Zhukov]

I just spend a lot of time to fix a trouble with Cisco AS5300 (AS5350) 
BYE message disapearing.
The same not resolved case here:
http://lists.iptel.org/pipermail/serusers/2005-July/021698.html

The source of trouble was in the nat_uac_test parameter 16:

Here is the part of cisco log:
Jul 31 12:16:00.726 UKR: CCSIP-SPI-CONTROL: 
act_idle_connection_created: Connid(1) created to 193.28.184.13:5060, 
local_port 50058

--Skipped---
Jul 31 12:16:00.738 UKR: Sent:
INVITE sip:3039100 at 193.28.184.13:5060 SIP/2.0
Via: SIP/2.0/UDP  193.28.184.21:5060
From: <sip:2308228 at 193.28.184.21>;tag=12E601F8-10C7
To: <sip:3039100 at 193.28.184.13>

Via header the same in the all availible IOS-es.

As the result openser considerate the Cisco is out of the nat box.

The question is: Can someone show me the case when this parameter is 
necessary, before I'll switch it of on the production server?

Thanks in advance.

Andrew O. Zhukov.