[SR-Users] Kamailio -topoh- and Via headers

[Daniel-Constantin Mierla]

Hello,

received is added because the client requests that via rport parameter 
or because of using rport. If the processed request is REGISTER, you can 
try removing rport/received parameters from Via, then do 
msg_apply_changes().

However, without rport enforcement, the response might not be routed 
back, because SIP says to send it back to the address in Via, which is 
invalid in websocket case.

Maybe you can rewrite headers in nginx or use kamailio as a proxy/load 
balancer instead of nginx and then you have plenty of options to play 
with sip headers.

Cheers,
Daniel

On 06/10/14 02:39, Gonzalo Gasca wrote:
> I'm using Kamailio as SIP Registrar using Websockets.
> My topology looks like this:
>
> Sip client (sipml5) ---> wss ---> Nginx ---> ws ---> Kamailio 4.1.5
>
> When I look into my SipMl5 application in the Register Message 200 OK
> from Kamailio I see the Nginx private IP address 172.31.22.2
>
> Via: SIP/2.0/WSS
> df7jal23ls0d.invalid;rport=37111;received=172.31.22.2;branch=z9hG4bKtv75otkzmPVsdNWevweLt4TN9JnLnQ0p
>
> How can I remove private IP Address in Via header to achieve topology hiding?
>
>  From Kamailio logs:
>
> Oct  6 00:34:21 ip-172-31-27-85 /usr/sbin/kamailio[8941]: DEBUG:
> registrar [reply.c:374]: build_contact(): created Contact HF: Contact:
> <sips:gogasca at df7jal23ls0d.invalid;rtcweb-breaker=no;transport=wss>;expires=200#015#012
> Oct  6 00:34:21 ip-172-31-27-85 /usr/sbin/kamailio[8941]: DEBUG: sl
> [sl.c:288]: send_reply(): reply in stateless mode (sl)
> Oct  6 00:34:21 ip-172-31-27-85 /usr/sbin/kamailio[8941]: DEBUG:
> <core> [msg_translator.c:204]: check_via_address():
> check_via_address(172.31.22.2, df7jal23ls0d.invalid, 0)
> O
>
>
> Version: kamailio 4.1.5 (x86_64/linux)
>
> # ------ topoh --------
>
> modparam("topoh", "mask_key", "opencall")
> modparam("topoh", "mask_ip", "<Public IP Address of Kamailio>")
> modparam("topoh", "vparam_prefix", "llamato")
> modparam("topoh", "mask_callid", 1)
> modparam("topoh", "sanity_checks", 1)
>
>
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-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda

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