U1900s can be connected to traditional PBXs through () to maximize customers' ROI in the early stage. (Multiple Choice)

The correct answer is A. ATO B. PRA. Connecting a U1900 to a traditional PBX requires legacy telephony interfaces - ATO (Analog Trunk Office) provides analog line connectivity, and PRA (Primary Rate Access, i.e., ISDN PRI) provides digital trunk connectivity. Both allow the U1900 to integrate with existing PBX…

Question

Options

AATO
BPRA
CSIP
DH.323

How the community answered

(34 responses)

A
85% (29)
C
6% (2)
D
9% (3)

Explanation

Connecting a U1900 to a traditional PBX requires legacy telephony interfaces - ATO (Analog Trunk Office) provides analog line connectivity, and PRA (Primary Rate Access, i.e., ISDN PRI) provides digital trunk connectivity. Both allow the U1900 to integrate with existing PBX infrastructure without replacing it, which directly protects the customer's existing investment and maximizes ROI during the transition phase.

SIP and H.323 are IP-based signaling protocols used for VoIP communication between IP-capable systems; traditional PBXs do not natively speak these protocols, so they cannot serve as the interconnection method with a legacy PBX without additional IP gateway equipment - which defeats the "early stage ROI" goal.

Memory tip: Think "AP connects to legacy" - ATO (Analog) and PRA (ISDN/digital) are the two physical/circuit-switched interfaces that speak the same language as traditional PBXs, while SIP and H.323 belong to the IP world and require both sides to be IP-ready.

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