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B-13
Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
Appendix B System Usage of MGW Keepalive Parameters, Release 5.0
Keepalive for Release 5.0 Prior to Maintenance Release 1.1
Basic Scenario
The basic scenario is shown in
. The MGW is reachable (an ACK is received during each KA
attempt) and has no stable calls, and no MGCP messages have been exchanged between the BTS 10200
and the MGW for a time interval equal to the provisioned value of
mgcp-keepalive-interval
(default 60
seconds) in the
mgw-profile
table.
Figure B-8
KA Attempts—MGW Reachable with No Stable Calls
Note
For detailed examples of successful KA attempts, see
and
.
The system takes the following actions in the scenario shown in
:
•
If KA attempts are successful, and stable calls exist: The system implements the KA pattern shown
in Scenario 1. (See
.)
•
If KA attempts are successful, and no stable calls exist: The system continues this pattern of KA
attempts (
Scenario 2 (Special Case)—Reachable RGW with 16 or Fewer Endpoints and No Stable
•
If a KA attempt is unsuccessful: The system implements the KA pattern shown in Scenario 3. (See
.)
250027
KA 1
KA 2
KA
3
KA 4
KA 5
KA 6
KA 7
Time
x = provisioned value of
mgcp-keepalive-interval
(default = 60 seconds)
The intervals with no MGCP
command activity increase
exponentially, but are limited
to a maximum value of
mgcp-max-keepalive-interval
as shown.
mgcp-max-keepalive-interval
(default = 600 seconds)
2x
x
x
8
x
4x