[sr-dev] double record-routing also at outbound edge

[Peter Dunkley]

I was under the impression that one advantage of outbound is that is 
replaced the need for non-standard solutions such as contact-aliasing 
and adding received headers to things like Path:

I don't understand (functionally) what the difference between a 
flow-token in a Path: header and the received parameter is.  So I don't 
understand why a flow-token can't be put in a Path: header when using 
GRUU.  I can see that you don't need to put flow-tokens in Record-Route: 
headers when using GRUU because the route-set used for in-dialog routing 
will be based on the Path: stored in the location table - but it seems 
to me that this makes putting the outbound flow-token in to the Path: 
headers essential.

Regards,

Peter

On 25/04/13 18:03, Peter Dunkley wrote:
> But isn't the received parameter stuff on Path: a Kamailio proprietary 
> solution?  I thought the outbound flow-token was the correct way to do 
> that on Path:?
>
>
> On 25/04/13 17:00, Juha Heinanen wrote:
>> Peter Dunkley writes:
>>
>>> If the edge proxy does not add a flow-token to the Path: header how 
>>> will
>>> INVITEs ever get to client devices behind NATs?
>> they do, because when ua behind NAT registers, edge proxy adds received
>> param to path header that contains the ip address/port of the ua at the
>> nat box.
>>
>> i just tested and it worked fine.
>>
>> register from edge proxy to registrar (note received in path header):
>>
>> Session Initiation Protocol
>>      Request-Line: REGISTER sip:test.fi SIP/2.0
>>      Message Header
>>          Via: SIP/2.0/TCP 
>> 192.98.102.10:5070;branch=z9hG4bKf1e.275e3219c0b2e50b00e32ce46abf509c.0
>>          Via: SIP/2.0/WS 
>> lkh33af7k3up.invalid;rport=62121;received=192.98.104.2;branch=z9hG4bK2333142
>>          Max-Forwards: 16
>>          To: <sip:jh at test.fi>
>>          From: "Juha Heinanen" <sip:jh at test.fi>;tag=hesufr3300
>>          Call-ID: fv0rqlp5tcdv2uden3grb6
>>          CSeq: 88 REGISTER
>>          Contact: 
>> <sip:rebu3li2 at lkh33af7k3up.invalid;transport=ws>;reg-id=1;+sip.instance="<urn:uuid:480356d7-8507-4ad8-bf27-292d463224f2>";expires=600
>>          Allow: ACK,CANCEL,BYE,OPTIONS,INVITE,MESSAGE
>>          Supported: path, outbound, gruu
>>          User-Agent: JsSIP 0.3.0
>>          Content-Length: 0
>>          Path: 
>> <sip:192.98.102.10:5070;transport=tcp;lr;received=sip:192.98.104.2:62121%3Btransport%3Dws>
>>
>> invite from registrar/home proxy to edge proxy (note route header
>> containing received):
>>
>> Session Initiation Protocol
>>      Request-Line: INVITE 
>> sip:rebu3li2 at lkh33af7k3up.invalid;transport=ws SIP/2.0
>>      Message Header
>>          Record-Route: <sip:192.98.102.20:5070;transport=tcp;r2=on;lr>
>>          Record-Route: <sip:192.98.102.20;transport=tcp;r2=on;lr>
>>          Via: SIP/2.0/TCP 
>> 192.98.102.20:5070;branch=z9hG4bKd777.2d854da9ddf108b1a4f6278cdd384c2b.0;i=2
>>          Via: SIP/2.0/TCP 
>> 192.98.102.10:5064;branch=z9hG4bKbd2c5fb6ce49eaec;rport=51603
>>          Contact: 
>> <sip:0x262d610 at 192.98.102.10:5064;alias=192.98.102.10~51603~2;transport=tcp>
>>          Max-Forwards: 16
>>          Route: 
>> <sip:192.98.102.10:5070;transport=tcp;lr;received=sip:192.98.104.2:62121%3Btransport%3Dws>
>>          To: <sip:jh at test.fi>
>>          From: "" <sip:test at test.fi>;tag=c8c7348f9ae4a7d4
>>          Call-ID: 4095ecb4e893586f
>>          CSeq: 33849 INVITE
>>          User-Agent: baresip v0.4.3 (x86_64/linux)
>>          Allow: INVITE,ACK,BYE,CANCEL,REFER,NOTIFY,SUBSCRIBE,INFO
>>          Content-Type: application/sdp
>>          Content-Length: 521
>>          P-Asserted-Identity: <sip:+35852345671 at test.fi>
>>      Message Body
>>
>> -- juha
>>
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