[SR-Users] Issue with ACK's

[Alex Balashov]

Hi,

Note that there are two different kinds of ACKs. An ACK for a 2xx
transaction is an in-dialog request that follows the rules for Section
13, and having two Via hops in one of those is entirely appropriate.

On Fri, Nov 30, 2018 at 02:59:52PM +0000, Dan Quinney wrote:

> Hi all, 
> 
> I’m having some issues with ACK’s.
> 
> Specifically, when an ACK reaches Kamailio from either Asterisk or an endpoint, Kamailio is adding a second Via header - which isn’t valid as per RFC 3261 (17.1.1.3);
> 
> 	“The ACK MUST contain a single Via header field, and this MUST be equal to the top Via header field of the original request."
> 
> Endpoints are registered with Kamailio but INVITES are routed via Asterisk for dial plan and media reasons.
> 
> I’m running fairly bog-standard Kamailio and Asterisk installs.
> 
> I’ve attached a sample PCAP for if anyone has any suggestions.
> 
> Thanks.
> Dan
> 


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-- 
Alex Balashov | Principal | Evariste Systems LLC

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