1 Audience
This document is intended for the SIP trunk customer’s technical staff and Value Added Retailer (VAR)
having installation and operational responsibilities.
2 Introduction
This Configuration Guide describes configuration steps for Cox SIP trunking to a Cisco UC-320 PBX. Cox
SIP trunking is a scalable and efficient IP trunking telecommunication solution for your business that
provides all the traditional services such as Direct Inward Dialing, Hunting, Calling Name, Calling Number,
Local/Long Distance and Business Continuity options, including:
Burstable Trunk Capacity – Dynamically increases call capacity during peak busy periods so your
customers never receive a busy signal.
Call Forward Always – On the trunk group pilot number for all calls in case of an outage (i.e.,
flood, fire, loss of power, etc.).
Call Forward Not Reachable – On the trunk group pilot number that operates on a per-call
contingency basis to forward the call to any PSTN number (i.e., call center or alternate office
location) during temporary call completion impairments.
Route Exhaustion – Automatic reroute of trunk group calls to any PSTN phone number (i.e., a call
center) if calls can’t be completed to the PBX.
Support for geo-redundant PBX deployments and automatic reroute of SIP trunks to the backup
customer data center.
All calls are routed over Cox’s national fiber network with guaranteed Quality of Service (QoS); calls never
traverse the Internet.
Figure 1 - Cox Fiber Network
Property of Cox Communications, Inc.
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