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As of IOS version 12.4(11)XW Caller ID Name support has  been added to the H323 feature set. In the past, caller id name delivery was only available with MGCP or SIP.  The following is an excerpt from Cisco.com

Here are the necessary commands to enable caller ID with h323. The ‘h225 display-ie ccm-compatible’ command can be entered system wide or h323 class based.

router#config t
router(config)#

!– System based configuration
router(conf-serv-h323)#h323
router(conf-serv-h323)#h225 display-ie ccm-compatible

!– H323 Class based configuration
router(config)#voice class h323 1
router(config-class)#h225 timeout ntf 100
router(config-class)#h225 display-ie ccm-compatible
router(config-class)#

!– Interface Configuration
router(config-class)#int s0/2/0:23
router(config-if)#isdn supp-service name calling

http://www.cisco.com/en/US/products/ps6706/prod_release_note09186a0080837f1a.html#wp329995

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