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C-5
Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
Appendix C Overload Control
Configuring
Configuring Emergency Call Handling
The BTS checks the:
•
Called-party number for all incoming calls against the EMERGENCY-NUMBER-LIST
•
Calling party category (CPC) in ISUP calls
If the BTS determines it is an emergency call and the MCL is 1, 2, or 3, the BTS gives it priority and
does not rejected the call. If the MCL is 4, The BTS rejects all calls, including emergency calls.
To add a number to the EMERGENCY-NUMBER-LIST, enter a command similar to the following:
add emergency-number-list digit_string=911;
Reply : Success: at 2006-02-28 09:48:40 by btsadmin
MNT add successful
Transaction 934823299797597704 was processed.
To display the EMERGENCY-NUMBER-LIST, enter:
show emergency-number-list;
DIGIT_STRING=911
Reply : Success: at 2006-02-28 09:48:45 by btsadmin
Entry 1 of 1 returned.
To delete a number from the EMERGENCY-NUMBER-LIST, enter a command similar to the
following:
delete emergency-number-list digit_string=911;
Reply : Success: at 2006-02-28 09:52:20 by btsadmin
MNT delete successful
Transaction 934823480106794504 was processed.
Configuring SIP Message Handling
When processing an incoming SIP call, the BTS looks at the MCL of the CA. It uses the following
factors to decide whether to accept or reject the message:
•
SIP Message Type
•
Call type (normal or emergency)
•
Configured rejection percentage
•
Current MCL status
SIP Message Types
Message Rejection: INVITE
If overloaded BTS rejects a percentage of incoming INVITE messages. The percentage rejected is based
on sia.cfg. Only new INVITE messages are checked for acceptance. Re-INVITE messages are always
accepted.