Avaya BSGX4e User's Guide Page 266

  • Download
  • Add to my manuals
  • Print
  • Page
    / 456
  • Table of contents
  • TROUBLESHOOTING
  • BOOKMARKS
  • Rated. / 5. Based on customer reviews
Page view 265
266 BSGX4e Business Gateway User Guide
NN47928-102 Release 01.01
SIP Call Server Access
This section describes how to configure a server profile, which determines how the
session controller accesses SIP proxy servers to provide VoIP service.
One of the session controller settings specifies the call server profile that the session
controller is to use. A server profile can explicitly specify up to three SIP proxy
servers or it can specify no servers. If no server is explicitly specified, the session
controller locates a SIP proxy server by using DNS SRV (as defined by RFC 2782 and
RFC 3263).
NOTE: If the SIP server is to be found by DNS, you must configure the DNS client.
Refer to “DNS Client” (page 50).
NOTE: The firewall is automatically updated to accept SIP messages from each
SIP server specified or located.
Call Server Failover
Call server failover prevents VoIP service interruption by providing backup call
servers. Call server failover is available only if the server profile used by the session
controller explicitly specifies more than one SIP proxy server. Then, if the current
SIP proxy server becomes unavailable, the session controller can reference the next
SIP server in the profile.
The session controller detects that the call server might be down if it:
cannot connect to it (for example, if the WAN interface is unplugged, or if an IP
route is not available)
does not receive SIP replies from it.
When the session controller detects that a server might be down, it attempts a
number of retries before it marks the server as down. (The server profile specifies
the number of retries.)
If the server is still unavailable after the retries, it is marked as down for the
duration of the blacklist timer. (The server profile specifies the blacklist timer
duration.) When the timer expires for a downed server, the session controller
attempts to recontact the downed server.
While a SIP proxy server is marked as down, the session controller uses the next
available SIP server. When a higher-priority server becomes available, the session
controller switches back to the higher-priority server.
The session controller cannot establish SIP calls if the current SIP call server goes
down and no other SIP server is available. In this case, the session controller
repeatedly attempts to reconnect to the server and resumes call service as soon as
the server comes back up. The availability of a second or third SIP server allows the
session controller to use failover and avoid interrupting SIP phone service.
Additional Inbound Servers
The SIP session controller can accept inbound messages from additional SIP servers if
those servers are explicitly specified in the server profile currently in use.
Page view 265
1 2 ... 261 262 263 264 265 266 267 268 269 270 271 ... 455 456

Comments to this Manuals

No comments