[Freeswitch-users] FreeSWITCH Registrar TLS offload

[Vladyslav Zakhozhai]

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 at 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 at 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 at domain.com
>> Contact:   "" <sip:user at 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
>>
>>
>> _________________________________________________________________________
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>>
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>>
>
>
>
> --
> Alexandru Covalschi
> VoIP engineer and system administrator
> tel: +37367398493
>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at 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
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