Chapter 10: System Failover And Survivability; Supporting Survivability - Avaya 9601 Administering

Chapter 10: System Failover and

Supporting survivability

SIP software provides support for simultaneous calls from multiple servers to accommodate
situations that can occur due to network or server failures. This support ensures that contact data is
preserved and actionable during failover transition, active calls continue, and that much of the
deskphone functionality is available. The following secondary gateways are supported:
• Avaya Secure Router 2330 and 4134
• Audiocodes MP-series analog and BRI gateways; Audiocodes MP-series using SIP over UDP,
TCP or TLS for signaling and RTP or SRTP for media
• Cisco 2811 ISR; Cisco ISR using at least one combination of UDP, TCP or TLS for signaling
and RTP or SRTP for media
• Juniper SRX 210 and 240
• I55
• Teldat Vyda gateway
• Expanded survivability to Avaya Aura
Deskphones fail over to a secondary controller for alternate registration (SES Failover to Session
Manager (SM) to a non-AST controller). Simultaneous registration occurs between SMs/BSM
(Branch Session Manager) as opposed to alternate registration from SES to SES or SES/SM to a
non-AST controller. This arrangement facilitates faster failover/failback transitions than that of the
failover solutions offered in previous SIP software releases and provides minimal (if any) disruption
from an end user viewpoint.
Contact caching and caching limits in a Session Manager environment are supported. Multiple
operations on a cached contact are not allowed. Preserved media connections/calls are supported.
During failover, changes to applications other than Contacts are cached and are updated by the
PPM with which the phone successfully registers.
If the SIP connection recovery is in progress due to a brief network outage, the phone will also
attempt to recover its XMPP connection to Presence Server automatically by re-logging in to PS. If
the PS server is unreachable, Presence will not be available. If the connection recovery fails, the
phone will display an appropriate error message.
Administering Avaya 9601/9608/9611G/9621G/9641G/9641GS IP Deskphones SIP
122
Survivability
®
Session Manager
Comments on this document? infodev@avaya.com
August 2015