SBC Rejects Incoming Requests with SIP 503

Asset ID:	1-71-2019100.1
Update Date:	2017-05-29
Keywords:

Solution Type Technical Instruction Sure

Solution 2019100.1 : SBC Rejects Incoming Requests with SIP 503

Applies to:

Acme Packet 4500 - Version E-Cx6.3.x and later
Information in this document applies to any platform.

Goal

SBC will reject incoming traffic with SIP:503, without any alarm in the logs

Solution

This could be happening due to traffic rate constraints limitations, as right below:

session-constraints
  name SAMPLE_RATE
  state enabled
  max-sessions 0
  max-inbound-sessions 0
  max-outbound-sessions 0
  max-burst-rate 0
  max-inbound-burst-rate 0
  max-outbound-burst-rate 0
  max-sustain-rate 0
  max-inbound-sustain-rate 0
  max-outbound-sustain-rate 0
  min-seizures 5
  min-asr 0
  time-to-resume 0
  ttr-no-response 0
  in-service-period 0
  burst-rate-window 0
  sustain-rate-window 0
  rate-constraints
  method INVITE
  max-inbound-burst-rate 25
  max-outbound-burst-rate 0
  max-inbound-sustain-rate 25
  max-outbound-sustain-rate 0
  last-modified-by admin@10.235.48.253
  last-modified-date 2014-10-28 00:13:11

Make sure that incoming traffic is not causing your network to overflow with more requests than configured.

References

<NOTE:1901448.1> - Error Correction Policy for Acme Packet Legacy and Re-Branded Oracle Communications Products

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