Hi Alex,

Is it actually dead, as in unsupported by the RFC or Kamailio? If so would that explain why Kamailio gives that error and doesn't appear to process it?

We certainly don't have end-to-end security as Kamailio is acting as a proxy between the device and Asterisk.

Thanks for your advice!

On Fri, 22 Feb 2019 at 15:08, Alex Balashov <abalashov@evaristesys.com> wrote:

Hi,

The sips: scheme is effectively dead, since the RFC requires that a
sips: next-hop guarantee end-to-end security, which it cannot. It has
been effectively replaced by use of ;transport=TLS.

On Fri, Feb 22, 2019 at 02:58:05PM +1300, David Cunningham wrote:

> Hello all,
>
> We're having an issue with Kamailio not processing an ACK and hope someone
> can help. A PCAP shows that Kamailio is receiving the ACK, and we believe
> these log messages are directly related to it:
>
> Feb 21 10:54:01 hostname /sbin/kamailio[15854]: ERROR: tm [ut.h:279]:
> uri2dst2(): ERROR: uri2dst: bad transport for sips uri: 1
> Feb 21 10:54:01 hostname /sbin/kamailio[15854]: ERROR: tm [t_fwd.c:1777]:
> t_forward_nonack(): ERROR: t_forward_nonack: failure to add branches
> Feb 21 10:54:01 hostname /sbin/kamailio[15854]: ERROR: sl [sl_funcs.c:387]:
> sl_reply_error(): ERROR: sl_reply_error used: Unresolvable destination
> (478/SL)
>
> The ACK is as follows. It's from telephone 111111 which is using TLS, which
> Kamailio listens for on port 5061.
> Does anyone know which URI has the bad transport as per the error above?
> Might it be the From URI "sips:111111@es8.example.com" because it doesn't
> specify port 5061?
> Thank you in advance.
>
> Session Initiation Protocol (ACK)
> Request-Line: ACK sips:105@70.42.xx.xx:5070 SIP/2.0
> Message Header
> Via: SIP/2.0/TLS 50.78.yy.yy:5061;branch=z9hG4bK741961203
> Route: <sips:70.42.xx.xx:5061;transport=tls;r2=on;lr=on>
> Route: <sips:70.42.xx.xx;r2=on;lr=on>
> From: ES8 Test 102 <sips:111111@es8.example.com
> >;tag=Nf5GG!Orq!MSmGfeu66F03F2114df82b
> To: <sips:105@es8.example.com:5061>;tag=as7a72b209
> Call-ID: 222222@50.78.yy.yy
> CSeq: 94679 ACK
> Contact: <sips:111111@50.78.yy.yy:5061;transport=tls>
> Max-Forwards: 70
> User-Agent: ewb2bua/15.3.0
> Content-Length: 0
>
> --
> David Cunningham, Voisonics Limited
> http://voisonics.com/
> USA: +1 213 221 1092
> New Zealand: +64 (0)28 2558 3782

> _______________________________________________
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--
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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David Cunningham, Voisonics Limited
http://voisonics.com/
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782