Re: [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  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 +, 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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>> sr-users@lists.kamailio.org 
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users 
>> 
> 
> 
> -- 
> Alex Balashov | Principal | Evariste Systems LLC
> 
> Tel: +1-706-510-6800  / +1-800-250-5920 
>  (toll-free) 
> Web: http://www.evaristesys.com/ , 
> http://www.csrpswitch.com/ 
> 
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> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users 
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Re: [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 +, 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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> sr-users@lists.kamailio.org
> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users


-- 
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) 
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

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