Timing considerations
Issue 1.1 June 2005 85
Conditions that trigger Link Recovery
Link Recovery begins with detection of either:
● A TCP socket failure on the H.248 link
or
● Loss of the H.248 link within 40-60 seconds
H.248 Link Recovery processes
Link Recovery design incorporates three separate timers that monitor the period of time that the
server or gateway spends in specific Link Recovery processes. Tab l e 7
lists the timer
parameters.
The sequence of events during Link Recovery is described in Table 8.
Table 7: H.248 Link Recovery timers
Timer Location Description Value
range in
minutes
(default)
Link Loss Delay Timer Server The length of time that the server retains
call information while the gateway attempts
to reconnect to either its primary server or
to alternate resources.
1-30
(5)
Primary Search Timer Gateway The length of time that the gateway spends
trying to connect to the primary server.
1-60
Total Search Timer Gateway The length of time that the gateway spends
trying to connect to all alternate resources.
1-60
Table 8: General Link Recovery process
Process
sequence
Description
1. Link failure detected
2. The Primary and Total Search Timers begin running. The gateway attempts to
re-establish the H.248 link with the original server, which is the first element in
the Media Gateway Controller (MGC) list.
1 of 2
To Next Page
Loading...
Need help?
General
