[cisco-voip] "call preserve" doesn't exist

[Cheng]

Have CallManagers at central site and an H323 gateway with PRI at remote
site. The remote h323 voice gateway is running IOS 12.4-11,
on the call manager , I enabled "Allow peer to preserve H323 calls"
on the voice gateway, I tried to config
voice service voip
h323
call preserve

but under h323, I can't find the call preserve command. then i added "no
h225 timeout keepalive"  amd then block the ip connectivity between the
phone and the callmanager server, the active call terminated shortly.

How can I preserve the active voice call when the WAN link fails?

Thanks in advance.
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