Reliability and Recovery
250 Avaya Application Solutions IP Telephony Deployment Guide
IP endpoint recovery
The Avaya server is designed to have a scalable architecture with different server components.
These components provide processing and relay signaling information between Communication
Manager and the Avaya IP endpoints. The architecture is inherently distributed, thus allowing
the system to be scalable to handle large number of endpoints, and flexible to work in different
network configurations.
This distributed nature of the architecture introduces additional complexity in dealing with
endpoint recovery, since failure of any element in the end-to-end connectivity path between an
IP endpoint and the switch software can result in service failure at the endpoint.
The recovery algorithm that is outlined here deals with detection and recovery from the failure of
signaling channels for IP endpoints. Such failures are due to connectivity outages between the
server and the endpoint, which could be due to failure in the IP network or any other component
between the endpoint and the server.
In the S8700 Server configurations the connectivity path between the endpoint and the server
is:
Endpoint
⇔
IP network
⇔
C-LAN
⇔
PN backplane
⇔
IPSI
⇔
IP network
⇔
S8700
In this configuration, IP endpoints register to C-LAN on the PN. The DEFINITY platforms G3r,
G3si, and G3csi, which support Avaya Application Solutions features, also use C-LAN for
signaling connecting to IP endpoints.
A C-LAN provides two basic reliability functions:
●
A C-LAN hides server interchanges from the IP endpoints. The signaling channels of the
endpoints remain intact during server interchanges, and do not have to be reestablished
with the new active server.
●
A C-LAN terminates TCP keepalive messages from the endpoints, and thus frees the
server from handling frequent keepalive messages.
Recovery algorithm
The recovery algorithm is designed to minimize service disruption to an IP endpoint in the case
of a signaling channel failure. When connectivity to a gatekeeper is lost, the IP endpoint
progresses through three phases:
●
Recognition of the loss of the gatekeeper
●
Search for (discovery of) a new gatekeeper
●
Re-registration
When the IP endpoint first registers with the C-LAN, the endpoint receives a list of alternate
gatekeeper addresses from the DHCP server. The telephone uses the list of addresses to
recover from a signaling link failure to the C-LAN/gatekeeper.
Содержание Application Solutions
Страница 1: ...Avaya Application Solutions IP Telephony Deployment Guide 555 245 600 Issue 3 4 1 June 2005 ...
Страница 20: ...About This Book 20 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 21: ...Issue 3 4 1 June 2005 21 Section 1 Avaya Application Solutions product guide ...
Страница 22: ...22 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 74: ...Avaya Application Solutions platforms 74 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 106: ...Call processing 106 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 124: ...Avaya LAN switching products 124 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 139: ...Issue 3 4 1 June 2005 139 Section 2 Deploying IP Telephony ...
Страница 140: ...140 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 186: ...Traffic engineering 186 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 204: ...Security 204 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 214: ...Voice quality network requirements 214 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 228: ...Avaya Integrated Management 228 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 239: ...Reliability Issue 3 4 1 June 2005 239 Figure 69 S8700 Media Server in a high reliability configuration ...
Страница 274: ...Reliability and Recovery 274 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 275: ...Issue 3 4 1 June 2005 275 Section 3 Getting the IP network ready for telephony ...
Страница 276: ...276 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 350: ...Implementing Communication Manager on a data network 350 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 356: ...Network recovery 356 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 366: ...Network assessment offer 366 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 367: ...Issue 3 4 1 June 2005 367 Appendixes ...
Страница 368: ...Appendixes 368 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 394: ...Access list 394 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 414: ...DHCP TFTP 414 Avaya Application Solutions IP Telephony Deployment Guide ...