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SBC - MTU limitation for incoming traffic

in Acme Packet (MOSC) 5 commentsAnswered ✓

Hi All,

Need your advice if possible.

I have an issue where incoming calls with the INVITE more than 1500bytes go missing. We are trying to isolate the issue whether it is SBC dropping them or the network side.

  • Is there a limitation from SBC to accept traffic more than 1500bytes ?
  • Trying to do a local packet trace from SBC but cannot see any traffic more than 1500bytes. No rejections. Is there any other way to check any rejections in tcp level ?

Config:

It is a TCP connection.

Interface "signaling-mtu=0"

system-config "ipv4-signaling-mtu=1500"

My understanding is, above config applying for the outgoing traffic from SBC. Not for incoming to SBC. Please correct me if I am wrong.

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