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How can I call to h323 endpoint from SX20 registered in CUCM?

I have an SX20 registered in CUCM and only can call to URI or extensions. How can I call to H323 endpoint from SX20. Do I have to configure a SIP route pattern to another device? How?

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CUCM is a SIP call control server, so the call would need to go through an Expressway-C/E so it can be interworked to H323.

Expressway and CUCM via SIP Trunk Deployment Guide (CUCM 8,9,10,11 and X8.8)