[SR-Users] Fwd: ACK is sent to wrong address when using serial forking

Minh Phan mphan at wengo.com
Wed Dec 15 07:54:49 CET 2021


Dear List,

As shown in the image below, Proxy 1 tries to do serial forking to Proxy 3
and then Proxy 4.

Upon reception of the 480 answer ( blue frame) from Proxy 2, the Proxy 1
generated an ACK (red frame) and sent it to Proxy 1. The problem I have is
that the ACK generated by Proxy 1 has a wrong RURI. I expect the ACK to be
sent to the URI of the CONTACT header of the 480 message (blue frame).
However, its RURI is the same as the one in the first INVITE of the
dialog.  Note that there is NO ROUTE header in the ACK message.

As there is serial forking here, the ACK is generated by the Proxy 1
itself.

Any hint would be appreciated,
Best Regards,
Minh Phan

PS: I am sorry if this mail is sent multiple times using different source
mail addresses. I didn't remember which one belonged to the list.

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