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SBC Not Responding to Inbound INVITE and REGISTER. TCP Connection Requests Rejected by SBC (Doc ID 2376687.1)

Last updated on JULY 05, 2023

Applies to:

Acme Packet 6300 - Version S-Cz7.2.0 to S-Cz7.4.0 [Release S-Cz7.0]
Acme Packet OS


Phones or Endpoints unable to register and make calls.

SBC rejecting incoming INVITE and REGISTER requests with 480 or 503 response.

TCP connection attempts are being rejected by SBC with RST,ACK response.


A network event appears to have been the catalyst to the problem, causing load balancing among multiple SBCs to fail.

Rather than balance registration attempts among the many SBCs, registration attempts spiked on one SBC.


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