19 Mar
2016
19 Mar
'16
10:54 p.m.
I understand intermediate endpoints *expect* these headers, this is why I
asked if there's anyway for Kamailio to remember what is removed and
essentially re-add them to the response, IE-
SIP request hits edge proxy from internal network > Via and Route headers
from intermediate proxies are removed, previous 'path' is stored in memory
linked to the dialog > SIP request is forwarded to end point.
End point responds to request via edge proxy > edge proxy looks up existing
dialog and reinserts the missing headers > forwards to the next hop.
What I'm asking is theoretically possible, although it may not be RFC
compliant or something that Kamailio supports.
Thanks
On Sun, Mar 20, 2016 at 2:40 AM, Alex Balashov <abalashov(a)evaristesys.com>
wrote:
On 03/19/2016 09:43 PM, Marrold wrote:
It should be theoretically possible to remove some of the via and
record-route headers, assuming the contact is
also re-written. The end
point's (phones) themselves do not need to be aware of anything
downstream of the SIP server they're registered too.
No, because intermediate endpoints:
(1) Expect the Route set to remain as configured between the two endpoints;
(2) Expect Vias corresponding to their hop to remain as upstream elements
remove theirs in transit.
You can't break SIP like that - terribly sorry! :-)
-- Alex
--
Alex Balashov | Principal | Evariste Systems LLC
1447 Peachtree Street NE, Suite 700
Atlanta, GA 30309
United States
Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
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