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Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
Appendix C Overload Control
Operating
Message Rejection: REGISTER
If overloaded BTS rejects a configured percentage of REGISTER messages.
Message Rejection: REFER
If overloaded BTS rejects a a percentage of incoming REFER messages.
Message Rejection: SUBSCRIBE
If overloaded BTS rejects a configured percentage of out-of-dialog SUBSCRIBE messages. The BTS
also rejects SUBSCRIBE messages without call contexts. The BTS does not reject SUBSCRIBE
messages received in an INVITE dialog.
Message Rejection: OPTIONS
If overloaded BTS rejects OPTIONS messages . There is no configuration required; all OPTIONS
messages are rejected between MCL1 and MCL4
Message: Unsolicited NOTIFY Repression
If overloaded BTS does not send unsolicited NOTIFY messages (MWI requests) to endpoints. However,
even if overloaded BTS does receive and process unsolicited NOTIFY requests.
UDP Messages
BTS drops messages like STUN if they are less than the configured size. This applies to UDP messages.
Message Rejection Logic
When the BTS rejects an incoming SIP call it responds with 500 or 503. Using CLI set the response code.
The BTS includes a “Retry-After” header in its response. The value (in seconds) in this header notifies
the endpoint the BTS will not receive further requests for the specified time. For example, “Retry-After:
5” means the endpoint should send the next request to the BTS until after 5 seconds has passed.
Operating
This section explains how to perform the following tasks:
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It also explains how this feature affects the following operational area:
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