You need to establish a connection from your Cisco Unified CallManager cluster to a service provider’s registrar server. Which trunk type should you select?

A.
intercluster trunk (non-gatekeeper-controlled)

B.
intercluster trunk (gatekeeper-controlled)

C.
H.225 trunk (gatekeeper-controlled)

D.
SIP trunk

Explanation:

There are three types of SIP server (SIP User Server)

Proxy Servers,
Redirect Servers,
Registar Servers – A registrar server processes requests from UACs (User Agent Client) for registration of their current location.