[cisco-voip] IOS 15.2-1(T1) and H323 Call Preserve (What is best practice?)

Tue Oct 25 16:43:07 EDT 2011

Is anyone using H323 Call Preservation with IOS 15.2.1.T1  and CallManager 8.5 ?

Using any IOS commands other than the below?  My first pass at this I used the commands under gateway at bottom which worked great in SRST testing after hours but during normal mode (non-SRST) I was having users complain about dropped calls, "show h323 gateway" I was seeing incrementing cause code 41 (temp failure).

CALLMANAGER SUMMARY STEPS
1.    Choose Service > Service Parameters.
2.    From the Service menu select Cisco Unified CallManager.
3.    Click Advanced.
4.    Scroll to the Clusterwide Parameter (Device -- H.323) section.
5.    Set the "Allow Peer to Preserve H.323 Calls" parameter to True.
6.    At the top of the screen click Update.

GATEWAY SUMMARY STEPS
!
voice service voip
h323
  call preserve limit-media-detection
!
end

THESE COMMANDS SHOULD NOT BE USED - DO NOT USE - REMOVE IF IN YOUR CONFIG
gateway
media-inactivity-criteria rtp
timer media-inactive 5
timer receive-rtp 1200

if you add the command under gateway in normal operation you might see;
show h323 gateway
 41 temporary failure (41)              73                 2

Reference
H.323 Configuration Guide, Cisco IOS Release 15.2M&T
http://www.cisco.com/en/US/docs/ios-xml/ios/voice/h323/configuration/15-2mt/voi-h323-cfg-gateways.html

Jason Aarons
Consultant
Dimension Data
904-338-3245 mobile
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