Personal Central Office Line (Pcol); Separation Of Bearer And Signaling (Sbs); Network Addressing Considerations; Data Networking - Avaya ESS User Manual

ESS Design and Planning

Personal Central Office Line (PCOL)

A Personal Central Office Line (PCOL) consists of a Central Office trunk that terminates on a
telephone or in a PCOL group shared by a number of telephones. During a failover, PCOL calls
can only be handled if the trunk and the station administered with it are under control of the
same ESS server.

Separation of Bearer and Signaling (SBS)

Separation of Bearer and Signaling (SBS) provides a low-cost, virtual private network over IP
trunks. During a failover, SBS calls will fail unless the CLAN for the signaling call and the bearer
trunks are under the control of the same ESS server. Alternate routes may be used if under the
control of the same ESS server as the originator.

Network addressing considerations

When implementing ESS, it is necessary that all Network Control Elements such as the Main
server(s), ESS servers, and IPSIs, be assigned static IP addresses. When a customer is
converting to an ESS environment, and normally receives IP addresses from a DHCP server,
the Network Control Elements must be given static IP addresses before adding ESS.
For information on assigning static IP addresses see:
Installing and Configuring the S8500 Media Server (03-300143), or
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Installing and Configuring the S8700 Series Media Server (03-300145).
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Both documents can be found at,

Data Networking

In an Avaya solution, IP connectivity is required for call control between an Avaya S8500 or
S8700 series servers and a reference IPSI. There can be a single call control connection called
Control Network A (CNA) or duplicated call control connections called CNA and CNB. CNA and
CNB can be on either a public or private network.
With the introduction of 3.0, a third call control connection called CNC is introduced. Using CNC
allows control to be passed through the customer LAN interface. This option allows customers
with local private control networks (CNA and CNB), to also use their enterprise (public) network
to support remote IPSI controlled Port Networks.
For more information on control networks see, Administration for Network Connectivity for
Avaya Communication Manager, issue 10, at, http://support.avaya.com.
70 Avaya Enterprise Survivable Servers (ESS) Users Guide
http://support.avaya.com.