[SR-Users] Issue with ACK's

[Dan Quinney]

Hi Alex,

Thanks for that, I’ve been reading the RFC but clearly missed the bit about section 13.

Dan

> On 30 Nov 2018, at 15:10, Alex Balashov <abalashov at evaristesys.com> wrote:
> 
> 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
> 
> Tel: +1-706-510-6800 <tel:+1-706-510-6800> / +1-800-250-5920 <tel:+1-800-250-5920> (toll-free) 
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> 
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