Alexandru, thank you for the answer. I think you've given me right direction to investigate. As you've mentioned this is really kamailio issue/question. So I'm moving to sr-users list. 2016-11-22 13:03 GMT+02:00 Alexandru Covalschi <568691@gmail.com>:
Do you have set_contact_alias or add_contact_alias in Kamailio? Anyways you're doing something wrong as AFAIK Kamailio translates contact header to udp automatically. You should try to post on sr-users list.
2016-11-22 12:33 GMT+02:00 Vladyslav Zakhozhai <v.zakhozhai@gmail.com>:
Hi,
I'm trying to understand what is the best or suitable approach to the following use case. Let me simplify thing a little bit.
Suppose we have one FreeSWITCH registrar behind SIP proxy (kamailio). I'd like to offload SSL/TLS encryption/decryption to SIP proxy:
REGISTER:
Request: UAC == SIP/TLS ==> Kamailio == UDP ==> FreeSWITCH:50 Reply: UAC <== SIP/TLS == Kamailio <== UDP == FreeSWITCH
INVITE: UAC1 == SIP/TLS ==> Kamailio == UDP == > FreeSWITCH == UDP ==> Kamailio == SIP/TLS ==> UAC2
(FreeSWITCH uses kamailio as outbound proxy with fs_path tag appended in dialplan).
The main problem is in Contact header which contains transport=tls and we can see it in FreeSWITCH console:
User: user@domain.com Contact: "" <sip:user@UAC_IP:57976;transport=tls> Status: Registered(TLS)(unknown) EXP(2016-11-22 10:16:59) EXPSECS(108) IP: SIP_PROXY_IP Port: 5060
When FreeSWITCH sends INVITE to UAC2 (during call) it tries to establish TLS session to UAC2. It fails because there is no TLS-enabled sofia profiles in the config of FreeSWITCH.
I have only one solution in my mind: rewrite transport tag in Contact header on SIP proxy (transport=udp to FreeSWITCH, and transport=tls to UAC).
I'd like to know it this solution ok or there is more elegant solutions.
I've tried appending tag transport=udp in FreeSWITCH's dialplan but no success.
Thank you in advance.
-- С уважением, Владислав Захожай
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
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-- Alexandru Covalschi VoIP engineer and system administrator tel: +37367398493
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
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-- С уважением, Владислав Захожай