Step 1. SIP trunk between CUCM and Expressway-C
After CUCM discovery is done by Expressway-C, Neighboring zone(s) are automatically configured for each node, and the transport protocol is discovered.
When the CUCM cluster is configured in mixed mode there is one zone for Transmission Control Protocol (TCP) for non-secure traffic with destination port 5060 and 1 zone for TLS (Transport Layer Security ) for secure traffic with destination port 5061. These ports can not be changed.
The two zones are used for all edge calls to and from the edge endpoints.
Inbound calls from the edge endpoints take the route of these auto-added zones and hence target TCP 5060 or TLS 5061 on CUCM.
Step 4. Configure dialplan
a.Transforms and/or Search Rules on Expressway-C and E
From Expressway Administration page, navigate to Configuration > Dial Plan > Transforms y Configuration > Dial Plan > Transform or Search Rules
But what if there is no CUCM in the mix? You might have endpoints directly registered to the C, or to a TMS. You'd definately need search rules (B), but a B2B also requires a traversal zone, which means you'd need a traversal client on the E (answer D). And you'd have to have this even if you were using a CUCM (or not). So I think the answers here are B and D
On Expressway-E you would need in that case a traversal server, not a client.
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