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New Member

Call Preserve

Morning guys an girls! :)

I wonder if anyone could shed some light on the call preserve feature under the voice class h323, I wanted to test if when failing between call managers using the h323 protocol whether when using the call preserve command would it preserve the call, and well it didnt.

I configured an access list to block me from the sub so that i would be forced to re register with the pub but the call still dropped. any ideas?

Thanks

7 REPLIES
VIP Super Bronze

Re: Call Preserve

For you to have call preservation with an H.323 gateway you need to configure the following:

voice service voip

h323

no h225 timeout keepalive.

This ensures that when TCP connection to callmanager is lost active calls are preserved

Please rate all useful posts "The essence of christianity is not the enthronement but the obliteration of self --William Barclay"
New Member

Re: Call Preserve

I was under the understanding that, that particular command was for SRST fallback rather then call manager to call manager?

I was under the impression that for the cm to cm, the call preserve command was what actually needed to be set.

after testing the call preserve command and the no h225 timeout keepalive command neither work :(

Cisco Employee

Re: Call Preserve

H.323 VoIP Call Preservation Enhancements for WAN Link Failures

http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/h323pres.html

that command is for CUCM redundancy of dial-peer, not related to SRST

HTH

javalenc

if this helps, please rate

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
New Member

Re: Call Preserve

Ok i resolved the issue, the call preserve call does work but only in conjunction with the call manager parameters being set correctly, under the system parameters.

Thanks guys!

VIP Super Bronze

Re: Call Preserve

What parameters under call manager?

Can you share here?

Can you also share the full config for the call preserve command..

Please rate all useful posts "The essence of christianity is not the enthronement but the obliteration of self --William Barclay"
New Member

Re: Call Preserve

after you have entered the "call preserve" command under the, voice class h323 "number". you then have to amend the Service Parameters under the CM under the advanced tab, Allow Peer to Preserve H.323 Calls* <--- set this to true.

then you enter the voice class h323 "number" under the particular dial peer.. pots... etc..

or you could do the call preserve command under the voice service voip command to affect all calls :)

Thanks ^_^

New Member

Re: Call Preserve

And what about CallManager 5+, 5.1.3 in my case. There is no "allow peer to preserve H.323 calls" param in Clusterwide Parameters (Device - H323)?

Does CUCM 5.1.3 support "H.323 VoIP Call Preservation" at all?

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