BT One Cloud Cisco
BT One Cloud Cisco
This document is for use solely within British Telecommunications plc. It should not
be discussed, shown or referred to outside the organisation without prior approval
from the author.
 British Telecommunications plc 2011
Registered Office 81 Newgate Street LONDON EC1A 7AJ
Registered in England no. 1800000
CONTENTS
1
Introduction
3
2
Proposition & Portfolio
3
3
Product Model
6
4
Global Voice Network Overview
8
5
Product Definition
9
6
Connectivity to the Service
BT BT One Cloud Cisco
,
13
Page 2 of 17
1 Introduction
1.1 Executive Summary
BT One Cloud Cisco (based on Cisco’s Hosted Unified Communications Service – HUCS) is an
evolutionary step for telephony services in the world of IP. It allows Customers to integrate their data
and voice services in an efficient manner with the confidence of a BT service wrap and an Opex
pricing model i.e. Customers pay for the use of the service and not the high cost of setting it up.
Applications, computing and data networking are developing at an unprecedented rate. Once
consolidated into the data network, One Cloud Cisco takes advantage of these developments. This
provides Customers with tremendous opportunities to integrate the management of their media and
applications helping Users to consolidate information from whatever source. One Cloud Cisco plays
a key role in achieving that goal whilst reducing risk, reducing costs and insulating Customers against
the effects of change.
2 Proposition & Portfolio
2.1 Proposition
One Cloud Cisco is a scalable, business grade, Unified Communications application. The service is
interconnected to the PSTN via centralised in-country carrier trunks or per site to local PSTN carriers
in others. It enables businesses to dramatically reduce upfront investment costs whilst accelerating
the adoption of global unified communications. Instead of upfront investment in an expensive voice
and unified communications infrastructure, companies are able to take a first step into converged
communications by paying for their IP Telephony on a utility-based, per User pricing model. This
helps businesses to remove maintenance and investment costs typically associated with owning and
managing their communications infrastructure in-house (e.g. IP telephony).
One Cloud Cisco offers two key types of service; IP Centrex lines to phones and a trunking capability
for PBX connectivity. These services are brought together in a Customer dialling plan with telephony
call package options. The trunks service provides public access and termination as well as creating a
private network bridge to Centrex Users. The trunk types provide interfaces to both traditional and IP
PBXs. In delivering integration between legacy switches and IP Centrex lines the service facilitates a
hybrid experience and enables a gradual migration strategy. The IP PBX interface provides an option
for early IP PBX adopters desiring a Centrex rental model or additional resilience where there is a
high density of Users.
The service offers:

A Recurring Monthly Charge Payment Model.

Upgrades within product.

Carrier grade Central Break-In and Break-Out (CBIBO) (where available) with Public
Number Provision and Number Porting.

An Emergency Service Location compliance (CBIBO).

Compliance with other applicable Public Service regulatory obligations, data privacy etc.
(CBIBO countries).
BT BT One Cloud Cisco
,
Page 3 of 17

One Cloud Ciscoconnects to US PSTN via the Global Managed Voice network (GMV)

PBX connectivity to traditional and IP PBXs.
2.2 Benefits
For Customers the BT One Cloud CiscoService provides:
Consolidation and simplicity

A simple and predictable rental (capex free) commercial model.

The ability for Customers to consolidate their voice and data capabilities into a single
network with potentially lower infrastructure, support and maintenance costs.

A cost-effective way to quickly gain the benefits of convergence.

Reduced overheads as BT manage the service and upgrades.

Reduced complexity when moving from an enterprise to hosted telephony model.

The opportunity to maximise the value of existing investment; hybrid working with legacy
networks and PBXs.

Gateway capability to deliver seamlessly integrated services.
Cost savings and easy financial planning

Reduced costs.
expertise.

Within tariff OnNet calls between offices connected to the IP network.

Competitive OffNet PSTN charges for calls to citizens, businesses and other organisations.

No need for on-site break-out (e.g. ISDN30).

Unique commercial options package including bundled OffNet calls with enhancements

Reduced power supply at customer sites

Reduced footprint and hence accommodation costs for Customers.
OnNet routing, no accommodation or power costs, reduced in-house
Confidence and control

Improved service with BT’s Service Management Wrap to manage everything: voice/data
conversion, numbering, call-handling, secure accommodation.

One Cloud Ciscois uniquely supported and maintained by Cisco; Cisco guaranteed reliability
with a unique Reference Design model in Cisco laboratories.

Tried, tested and established platform with proven capabilities.

Reporting and management information to help Customers manage the service.

A simplified technology model – reduced number of suppliers, simplicity of installation,
management and migration.

No maintenance contracts.

A Self care portal enabling the Customer to maintain immediate control of some aspects of
the service.
BT BT One Cloud Cisco
,
Page 4 of 17

One supplier, one helpdesk and one bill.
Flexibility, coverage and future protection

Global coverage using BT’s extensive network reach (where regulation, service availability
and local conditions permit).

Easy adoption of new functionality and technologies.

A hosted voice solution with roadmap to full Unified Communications.

Network reliability: Carrier grade service.

Future protection; a roadmap to full unified communications, easier to plan with confidence.

The ability to adopt new functionality and technologies easily: future upgrade costs in tariff
i.e. hardware, software, service enhancements and security.

Quick to deploy and scale.
Efficiency and quality

Faster decision-making.

Better Customer service.

More effective team working, easier partner collaboration and improved speed to market.

Increased productivity.

A reduction in carbon footprint; uses BT power, accommodation.

The ability for IP Phones to go into a minimum power mode.
For Users, BT One Cloud Cisco provides:

The capability to easily make and receive calls and use features designed to enable efficient
ways of working. The features are easily accessible from an IP Phone (supplied separately).

Simplicity by providing intuitive controls for advanced features such as collaborative
working.

Simple, intuitive controls to valuable features such as call transfer, so saving administrative
time.

The ability for ad-hoc conferencing and other collaborative working capabilities to vastly
reduce travel expenditure and unproductive time spent away from the office.
2.3 Portfolio
2.3.1 One Cloud Cisco
In conjunction with an IP network and appropriate CPE, the service enables Customers to create a
voice network delivered over an MPLS data VPN connecting IP phone extensions (or Analogue
phones via Adaptors), traditional TDM (Time Division Multiplexing) and IP PBX's (Private Branch
Exchanges) on a platform managed and hosted by BT. The private voice network is connected to
the Public Telephone Network providing full voice network connectivity via Local Gateways or
Central Public accesses. Central Public Telephone accesses are integral to the service.
The service provides rapid cost effective access to the following services:
BT BT One Cloud Cisco
,
Page 5 of 17

Full PSTN/ISDN replacement services in countries where Central Break-In/Break-Out
(CBIBO) has been launched.

Integration with domestic voice services, where available and with appropriate premise
gateways.

Integration with LAN and premise voice CPE.

Integration with unified communications and collaborative tools

Support for applications such as Voice/Fax, PBX-based Voice Mail, PBX feature
interworking.

Flexible pricing offers with inclusive ‘OnNet’ calls, monthly service recurring charges and
usage based ‘OffNet’ minutes charges.

Connectivity via shared access to the Customer’s Quality of Service enabled IP network.
3 Product Model
IP phone
LAN
Local
Telephony
Networks
Local
Telephony
Networks
Optional
LBIBO
Service
Analogue
Handset
Hosted IPT-Cisco
Analogue
Telephony
Adapter
Line Services
WAN
PE
PABX
Voice
Gateway
LAN
Service
Other
Telephony
Networks
Associated Services
LAN
Telephony
CPE Services
Trunk Services
Central
Telephony
Network
WAN
Service
CBIBO
Service
Figure 1: Product Model
The core service infrastructure (the blue shaded area in the diagram above labelled ‘One Cloud
Cisco’) is hosted and maintained by BT. Customers are provided with:

Dialling plans – private and public call routing tables

Managed public call servers, call distribution, management network and gateways to/from the
PSTN

Billing of the service

Service management and service assurance

Self care provision
One Cloud Cisco has two key terminal types:

Lines to phones (IP Centrex).
BT BT One Cloud Cisco
,
Page 6 of 17

3.1.1
Trunks to PBXs
o
Creating a private network bridge to Centrex Users as well as providing public access
and termination.
o
Providing interfaces to traditional and IP PBXs.
Lines
The IP Centrex offer (or ‘line’) is the appearance of a line in the form of a telephone number on a
line button on a phone. Single line phones may have no buttons so the line appearance would
simply be the phone’s telephone number. The ‘line’ as such is a number associated with an
allocation of IP network bandwidth on the Customer’s data network.
3.1.2
Trunks
Trunks provide the capability of making simultaneous calls e.g. ten simultaneous calls could be
carried on ten concurrent trunks worth of bandwidth.
Beyond line and trunk appearances, there are optional line configurations, such as Hunt Groups,
Pick-up Groups, Shared Lines as well as optional features such as Voice Mail, Auto-Attendant
Console and Operator Console. For trunks, the signalling type is an important attribute providing
configuration options such as Presentation CLI (or Automatic Number Identification - ANI) and
associated features like Direct Dialling In (DDI) and number pools.
The service fits with other products in BTs portfolio e.g. BT MPLS (a quality of service enabled
WAN), CPE and LAN portfolio services provide service to terminal equipment. Associated offers
include traffic reporting, the inter-operability with Contact Centre capabilities, Voice recording and
interconnection with other Communications providers.
3.1.3
WAN Bandwidth
As a converged solution, One Cloud Cisco will run over the Customer’s data network which is not
part of the service. However, in managing the service BT will assist the Customer in locating faults.
The Customer will need to ensure their network is 6 CoS Differentiated Services Code Point
(DSCP) enabled and where necessary, purchase extra WAN bandwidth in site access links to their
premises to convey speech, potentially video and associated signalling.
The only bandwidth integral to the service is at the PoP and bundled with the product, i.e. the BT
MPLS access bandwidth from the One Cloud Cisco PoP to the associated BT MPLS Provider Edge
(PE) node.
At the PoP, the service provides a firewall or Session Border Controller (SBC), a Network Address
Translation (NAT) capability, and bandwidth for the conveyance of speech (G729a as the default),
fax data and service related signalling.
3.1.4
LAN Bandwidth
The Customer is also responsible for the provision of CoS enabled (6-CoS) LAN bandwidth and
voice related CPE: IP Phones, Voice Gateway, standard phones, soft-phone client software or PCs
to run soft-phones. For Lines this will include responsibility for Survivable Remote Site Telephony
BT BT One Cloud Cisco
,
Page 7 of 17
(SRST) functionality and for Trunks interfaces to PBXs and possible Gatekeepers or Session Border
Controllers (SBCs) depending on signalling and deployment choices.
The Central Break-In and Break-Out capability (available in some regions) provides PoP
bandwidth, interface equipment and onward conveyance bandwidth to toll carrier interfaces i.e. to
either BT Group partners or third party carriers.
4 Global Voice Network Overview
The diagram below provides an overview of the One Cloud Cisco network. It shows established
PoPs in the UK integrated into the UK PSTN and reach to the EMEA region with local break-out to
PoPs in the USA that serve the Americas. The Global Managed Voice (GMV) network is a shared
resource with Onevoice that both share US domestic egress to a US Toll carrier. This network
architecture opens a path to further integration with Onevoice services that have an extensive Global
reach. Local Break-Out provides a method for local access within the Americas beyond the US.
The Customer WAN can be exclusively BT or part BT and part 3rd Party. However, it must be BT to
at least a couple of Customer hand-off points from where the 3rd party MPLS distributes media and
signalling to other Customer sites i.e. the Customer’s MPLS must peer with the One Cloud CiscoPoP.
Consideration must be given to CPE access for configuration and maintenance.
Off-Net Signalling
Off-Net Media
On-Net Signalling
On-Net Media
UK PoPs established
as part of BT PSTN
UK
PSTN
HUCS POP pr 1
NGW
HUCS POP pr 2
Other Carrier
Networks
NGW
EMEA VoIP WAN
PE
US VoIP WAN
PE
PE
PE
Global Managed Voice
Network (GMV)
NGW
NGW
MPLS
PE
PE
Local
PSTN
PE
PE
US Hosted IPT-Cisco (HUCS) PoPs
interconnect to GMV bring alignment
with Onevoice. (Same Phoenix billing etc.)
MPLS Access Circuits
PSTN Trunks for
local break in/out
CE
Remote Phones
CE
CE
Remote Phones
CE
V
IP PBX
TDM PBX
Central Breakout capable Countries
i.e UK and US
Local Breakout only capable Countries
Early EMEA deployments
Figure 2: One Cloud CiscoNetwork Overview
BT BT One Cloud Cisco
,
Page 8 of 17
5 Product Definition
5.1 Central Functions
The One Cloud Cisco Platform has PoP sites in the US and UK. This central infrastructure is
maintained by BT and provides:

Line and Trunk Appearance services to connect phones, PCs and Customer PBXs to the
service.

A firewall (Session Border Controllers) between the BT platform private and the Customer IP
address space.

Network Address Translation and Port Address Translation.

Dialling plans - private (Site Location Codes for OnNet, where appropriate) and public
routing tables.

Managed public Call Servers, a VoIP distribution network and remote Media Gateways to the
Public Networks (US – GMV to domestic Toll carrier, UK – interconnect to BT UK PSTN).

Emergency Service call routing.

Voice VPN gateways (UK to Featurenet).

Local Break-In/Break-Out (LBIBO) signalling control and optional SRST configuration
management where Central Break-In/Break-Out is not used (requires on-site CPE access
permission for automation).

Resilience gateway signalling control and optional SRST configuration management where
there is Central Break-In/Break-Out (requires on-site CPE access permission for automation).

Access to a tiered Customer Administrator and User Self Care capability.

Connection to messaging services, VoiceMail and Group VoiceMail.

Call control to bar and allow call types by specific time periods.

Call Management to distribute calls and control call routing by Group and User criteria.

Control of CLI transmission

Billing infrastructure for one-off, recurring and Central Break-Out OffNet (public call) usage
charging.

Data capture for presentation to an interface to a third party Traffic Management Information
Reporting system
5.1.1 Dialling Plans
For any Customer installation the structure of a private numbering plan needs to be established at
the outset and include:

any planned expansion of site numbers,

the number of extensions at a given site.
BT BT One Cloud Cisco
,
Page 9 of 17
There are many scenarios for private number structures. Typically Customers do not have
‘Greenfield’ dial plan requirements. Therefore, a review is required to understand how migration to
One Cloud Cisco can be performed seamlessly and possibly in a staged manner over time.
Each One Cloud Cisco Customer will have their own unique dialling plan. That dial plan must
follow specific guidelines. The detailed guidelines are contained within the Design Rules and
Guidelines (DRAGs) and follow the basic principles set out below:
5.1.1.1

Each line will have one (or more) PSTN numbers associated with it.

Each line will have an ‘extension’ number.

Each Customer site will have a unique (to that Customer) ‘site location code’.

End Users will make PSTN calls by prefixing the full PSTN number by a leading digit
(typically 9).

The dialling plan links all Customer sites whether they use line appearances or trunk
appearances.
OnNet calling
OnNet (IP) calls can be made to other One Cloud Cisco line appearances and One Cloud Cisco
Trunks Users within the Customer network. These calls are zero-tariff and can be made by either
dialling an OnNet private number or by searching for the number within the IP Phones directory.
5.1.1.2
Forced OnNet calling
Forced OnNet is a least cost routing facility that ensures calls to OnNet destinations are routed as
OnNet calls even though the end-User has dialled the full PSTN number. This is important for
Customers since it avoids unnecessary PSTN call charges.
5.1.1.3
OffNet calling
Calls made to destinations outside the private network are OffNet or PSTN break-out calls. These
calls are made through the One Cloud Ciscoservice. In the UK calls that break-out to the PSTN
do so centrally. Local PSTN break-out can be provided for purposes of resilience – see section on
Local Break-In/Break-out. Outside the UK Local Break-Out is a necessity and is available.
5.1.1.3.1
IP Phone to PSTN calling
This provides outbound calling from BT One Cloud Cisco sites for all calls.
5.1.1.3.2
PSTN to IP Phone
This provides inbound calling to the BT One Cloud Cisco sites.
5.1.2 Central Break-In/Break-Out to PSTN
Central Break-In/Break-Out (CBIBO) connectivity to the PSTN uses a shared PSTN access gateway
for all Customers across the platform. PSTN break-out codes need to be dialled to reach the PSTN
network followed by the full PSTN national number. By default, the CLI is restricted but it can be
released by dialling the CLI release code.
Fully centralised PSTN Break-In and Break-Out is available in the UK and USA. Calls to the
PSTN - voice only - are priced at competitive rates (Harmonised Onevoice Domestic/Global Tariffs
in the US and Harmonised Featurenet domestic tariffs in the UK). PSTN access is provided within
the network with no need for additional gateways or PSTN lines. The use of CBIBO provides a full
two way PSTN like service with number portability rights but also regulatory obligations such as
BT BT One Cloud Cisco
,
Page 10 of 17
emergency access 911/999 (accurate location information), accessibility, data privacy and
availability compliance.
Alternatively Local Break-In/Break-Out (LBIBO) is offered for non-centralised Break-In/Break-Out
countries where the local provider charges for PSTN and has relevant regulatory obligation for a
PSTN service.
Where Central Break-Out is not available the Customer must select the local gateway option for
PSTN access
Call forwarding to the PSTN using a Central Break-Out gateway is supported. The forwarding
number should always be prefixed with the PSTN break-out code. All types of call forwards (call
forward all, call forward busy, call forward unanswered, etc.) are supported.
5.1.3 Local Break-In/Break-Out to PSTN
Using local gateways, One Cloud Ciscocan be connected to the PSTN network via the local incountry PSTN provider on a site by site basis.
Local Break-In/Break-Out is available in:

UK

USA

EMEA
In circumstances where no Central Break-In/Break-Out gateway is offered, routing a public call
requires a local area connection between a User terminal (IP Phone) and a local premise egress
gateway which in turn terminates a local telephony access service (e.g. Basic Rate Interface,
Primary Rate Interface both with DDI). In order for the connection to be established, specific
signalling control is required to the gateway from the One Cloud Ciscoservice. This is called Local
Break-In/Break-Out gateway control. This gateway is not part of the product. The One Cloud
Cisco service can create the telephony configuration profile for the gateway and manage the
configuration over time in response to extension or BRI/PRI channel quantity changes. Where
configuration access is provided these can be made automatically, or the configuration files will
need to be provided to a party who has access. Automated delivery provides a more responsive
service.
A Local Break-Out gateway at a location can support multiple PRI/BRI trunks.
If an IP Phone tries to call another IP Phone within the same location using its E.164 number, the
call is not routed to the PSTN and is sent back to the One Cloud Cisco network. This type of call is
called a forced OnNet call. When using a Local Break-Out gateway, forced OnNet calls are only
supported for intra-site calls (i.e., calls within the location) and not for inter-site calls.
BT BT One Cloud Cisco
,
Page 11 of 17
Figure 3: One Cloud CiscoLocal Break-In/Break-Out
5.1.4 Survivable Remote Site Telephony
A Survivable Remote Site Telephony (SRST) gateway can be provided if the Service is ordered
with Central Break-In /Break-Out access as the primary PSTN access. Site Resilience Gateway
Signalling Control provides an additional means of making and receiving public calls to the Central
Break-In/Break-Out routing path. This service option provides control of a local voice gateway in
normal operation. However, should communications be lost between the site and the One Cloud
Cisco service, the Resilience Gateway software (not part of the service) allows site IP Phones to reregister locally and provides an alternative means for telephony access for public call origination
and termination. Furthermore, local calls are possible between the Line Appearances terminating
on-site IP Phones. The Voice Gateways, line interfaces and local Communication Provider services
are not part of the service. If the Customer chooses to add SRST software to their gateway, One
Cloud Ciscocan provide telephony configuration data (as a downloaded dial plan) to allow
interoperability.
SRST can be provided either to all phones at the location or on a per-phone basis, with basic
telephony service when the WAN link or One Cloud Ciscois not available.
BT BT One Cloud Cisco
,
Page 12 of 17
5.2 Customer Self Administration
One Cloud CiscoCustomers have access to an optional web based self care interface, the Unified
Services Manager (USM). This interface allows local and remote administration of features from any
suitable web enabled device. Access is via BT’s GS Portal.
Self Care is a hierarchical service that allows Users to have increasing levels of control dependent on
their position or responsibilities in an organisation.
Location Administrators can control a population of End Users and above this sit Divisional
Administrators. The service will provide Customers with one Customer User ID. Divisional
Administrator, Location Administrator and End User ID’s are optional.
Administers
Locations
Via GUI
Via Web - Admin GUI manages many users
Resets users
– joiners/leavers
– name display changes, etc.
BT
Division/HQ
Administrator
Location Adminstrator
End User – Self Care
Via Web
Browser
Via phone screen
Manage features
Figure 4: Customer Self Service and Self Care
6 Connectivity to the Service
6.1 Standard Connectivity
The following sub-sections detail standard connectivity. The Access Types, CE Routers and
features/functionality that can be supported are described elsewhere in this document. One Cloud
Ciscowill support Customers who have mixed PBX (TDM & IP), Line Appearance (IP Phone) and
FeatureNet (UK legacy TDM Centrex only) requirements.
BT BT One Cloud Cisco
,
Page 13 of 17
6.1.1 UK Site Trunking with Standard Access and TDM Signalling to a Single PBX
The connectivity shown below is targeted at existing or new IPClear/IPConverge Customers with
TDM PBXs at some or all of their sites. It will provide the Customer with connectivity to One
Cloud Ciscovia their IPClear network and uses a CE router to provide direct connectivity to the
PBX, i.e. any required functionality is within the CE. Bandwidth and CPE required to support
HIPT must be ordered as part of the IPVPN proposition. Most UK TDMs are supported and can be
connected to HIPT in this manner. Customers requiring this service option must have spare DPNSS
ports on their PBX. Supported gateways are detailed in Error! Reference source not found..
Figure 5 – BT One Cloud Cisco via a single IPClear access with a compatible CE router to provide
connectivity to the Customer’s PBX; with CBIBO to the UK PSTN.
6.1.2 UK Site Trunking with Standard Access and IP signalling to a Single PBX
The connectivity shown below is targeted at existing or new IP Clear/IPConverge Customers with
IP PBXs at some or all of their sites. It will provide the Customer with connectivity to One Cloud
Ciscovia their IPClear network and uses a CE router to provide direct connectivity to the PBX.
Bandwidth and CPE required to support One Cloud Cisco must be ordered as part of the IPVPN
proposition. Most IP PBX’s are supported and can be connected to the service in this manner.
Customers requiring this service option must have spare SIP/H323 capacity on their PBX.
BT BT One Cloud Cisco
,
Page 14 of 17
Figure 6: One Cloud Cisco via a single IPClear access with a CE router to provide
connectivity to the Customer's PBX; with CBIBO to the PSTN
6.1.3 US Site Trunking with Standard Access and TDM Signalling to a Single PBX
The connectivity shown below is targeted at existing or new IPClear/IPConverge Customers with IP
or TDM PBXs at some or all of their sites. It will provide the Customer with connectivity to One
Cloud Ciscovia their Global MPLS network and uses a CE router to provide direct connectivity to
the PBX, i.e. any required functionality is within the CE. Bandwidth and CPE required must be
ordered as part of the IPVPN proposition. Most US TDMs are supported and can be connected to
the service in this manner. Customers requiring this service option must have spare Q.SIG/Q.931
ports on their PBX or a network connection for H.323/SIP. Supported gateways are detailed in
Error!
Reference
source
not
found..
Figure 7: One Cloud Cisco via a single IPClear access with a CE router to provide connectivity to
the Customer's PBX; with CBIBO to the PSTN
BT BT One Cloud Cisco
,
Page 15 of 17
6.1.4 UK - Line Appearance with Secure+ Accesses
The connectivity shown below is targeted at existing or new IPClear/IPConverge Customers with IP
Phones at some or all of their sites. It will provide the Customer with highly resilient connectivity
to One Cloud Ciscovia their IPClear network and uses one of two CE routers to provide direct
connectivity to the IP Phones. In the event of the primary access, primary CE or primary PE failing,
the traffic would be diverted to the failover PE/Access/CE. The IP addresses of the two CE routers
should be the same. Bandwidth and CPE required must be ordered as part of the IPVPN
proposition. A list of supported IP Phone types is included elsewhere in this document.
Figure 8 -One Cloud Cisco via IPClear Secure+accesses with an active CE router and a
standby CE router to provide connectivity to the Customer's IP Phones; with CBIBO to the
PSTN
6.1.5 UK Site Line Appearance with Standard Access
The connectivity shown in below is targeted at existing or new IPClear/IPConverge Customers with
IP Phones at some or all of their sites. It will provide the Customer with connectivity to One Cloud
Cisco via their IPClear network and uses a CE router to provide direct connectivity to the IP
Phones. Bandwidth and CPE required must be ordered as part of the IPVPN proposition. A list of
supported IP Phone type is included elsewhere in this document.
BT BT One Cloud Cisco
,
Page 16 of 17
Figure 9 -One Cloud Cisco via a single IPClear accesses with a CE router to provide
connectivity to the Customer's IP Phones; with CBIBO to the PSTN
BT BT One Cloud Cisco
,
Page 17 of 17