RedMax EXtreme EX-LRT Instrukcja Naprawy Pobierz pdf (Strona 77)

Oracle SBC Security Guide

Oracle recommends configuration of INVITE and REGISTER method rate constraints on session agents.

For SIP access deployments, rate constraints for individual method types along with a set of burst and

sustain rates should be considered. These constraints can help to avoid overloading the core network. In

addition, they restrain the load non-INVITE messages use, thus reserving capacity for INVITE-based

sessions and registrations.

In order to properly configure constraint limiting, either at SIP interface level or per Session-Agent (SA),

it’s essential to have an accurate understanding of the SIP Message flows that exist in the network.

Contributing factors include: factors such as which SIP requests are authenticated, what Call flows and

Session Agents require re-INVITEs, maximum CPS per SA, etc. The reason why these details are so

important is the SBC is making dynamic decisions and acting on this traffic in real time.

SNMP traps will be sent when constraints are exceeded. Constraint threshold crossing alarms or statistics

are not necessarily a security issue since legitimate traffic overloads or mass network restarts may also

cause them. It is up to the customer to assess if they should investigate alarms as possible security

incidents.

To monitor SIP interface and Session Agents, two commands are most useful. The following commands

include statistics on how many times the constraints were exceeded and the interface or session agent was

temporarily taken out of service.

show sipd interface <realm name> and show sipd agents <agent name>

ACMEPACKET# show sipd interface access

00:51:55-34

Sip Interface access

-- Period -- -------- Lifetime --------

Active High Total Total PerMax High

Inbound Sessions 9000 9002 1715 14244739 1501 9009

Rate Exceeded 5 5 5 5 5 5

Num Exceeded - - 0 0 0 -

Burst Rate 0 50 0 0 0 51

Outbound Sessions 0 0 0 0 0 0

Rate Exceeded - - 0 0 0 -

Num Exceeded - - 0 0 0 -

Burst Rate 0 0 0 0 0 0

Local Contacts 0 0 0 0 0 0

HNT Entries 0 0 0 0 0 0

Non-HNT Entries 0 0 0 0 0 0

Subscriptions 0 0 0 0 0 0

Out of Service - - 0 0 0 -

Trans Timeout 0 0 0 0 0 0

Requests Sent - - 0 284 1 -

Requests Complete - - 0 0 0 -

Seizure - - 0 0 0 -

Answer - - 0 0 0 -

ASR Exceeded - - 0 0 0 -

Messages Received - - 14097 114313292 12405 -

Latency=0.000; max=0.000

ACMEPACKET# show sipd agents 192.168.60.10

00:54:10-49

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 141 142

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RedMax EXtreme EX-LRT Instrukcja Naprawy Strona 77

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