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CUCM SIP Trunk through a Acme SBC

I setup a lab to test to see if I could make a call through a CUCM 10.5 to another 10.5 with two Acme SBC using SIP and PKI, far I have a trunk made but the CUCM wont sink with the Acme, or I have figured the sip trunk wrong in the CUCM or I am missing something simple. How everything looks is as follow.

CUCM>SIP>Acme SBC>Acme SBC>CUCM

why I'm doing this lab is to see if our Acme SBC can do sip to CUCM and not have to buy CUBES to replace them.

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Chris Deren
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From CUCM perspective it's just a SIP trunk to ACME border element, you will need to check their documentation on how to configure it for CUCM as Cisco does not have any official interoperability guides with Oracle ACME.  If you are having specific issues, you should look through CUCM SDL traces for what the SIP error codes are, or it might be easier on the ACME side to review traces.