SBC Doesn't Forward ACK
(Doc ID 2244257.1)
Last updated on DECEMBER 04, 2024
Applies to:
Acme Packet 3820 - Version E-Cz7.3.0 to E-Cz7.3.0 [Release E-Cz7.0]Information in this document applies to any platform.
Symptoms
It has been observed that SBC sometimes not forwarding the ACK which is sent for 200OK. We see in a trace that the SBC gets the ACK from UserA, the SBC forwards it to the SIP Server, the SIP Server returns the ACK to the SBC and now the SBC is supposed to send the ACK to UserB but it doesn't send it.
USER-A SBC SIP-SERVER USER-B
----INVITE------->
------INVITE----->
<-----INVITE-----
---------------INVITE------------->
<--------------180 RINGING----------
--------180 RINGING->
<---------180 RINGING-
<--------------200Ok---------------
--------200OK->
<---------200OK-
<------200OK------
-------ACK------->
------ACK------->
<----ACK---------
-------ACK(DROPPED)---------------> (THIS ACK was dropped by SBC DUE to duplicate branch i.d)
Changes
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| Applies to: |
| References |