PRI/BRI Backhaul
A Primary Rate Interface (PRI) and Basic Rate Interface (BRI) backhaul is an internal
interface amid the alarm abettor (such as Cisco UCM) and Cisco gateways. It is a separate
channel for backhauling signaling information. A PRI backhaul assiduously PRI Layer 3
(Q.931) signaling advice via a TCP connection.
An MGCP aperture is almost accessible to configure. Because the alarm abettor has all the callrouting
intelligence, you do not charge to configure the aperture with all the punch aeon it
would contrarily need. A downside is that a alarm abettor charge consistently be available. Cisco
MGCP gateways can use Survivable Remote Site Telephony (SRST) and MGCP fallback
to acquiesce the H.323 agreement to booty over and accommodate bounded alarm acquisition in the absence of a
Communications Manager (for example, during a WAN outage). In that case, you must
configure punch aeon on the aperture for use by H.323.