Hi, I'm from ser-userlist with a good news and testing results :)

FreeSWITCH do honor path header and will back responses and will originate calls to/through SIP proxy IP address if it is in the path.

Before relaying in Kamailio you need put add_path or add_path_received (both worked fine for me). FreeSWITCH will add it to Contact header:

Contact:     "" <sip:user_name@user_ip:49335;transport=tls;fs_path=sip%3Akamailio_ip%3Blr>

No manual manipulations on Contact header is needed from kamailio side (as well as from FreeSWITCH side).

But be aware of correct handling SIP requests (i.e. INVITEs) from FreeSWITCHes. For example my FreeSWITCHes backends are in dispatcher table (sip:IP_ADDR:UDP_PORT). And I've checked it with ds_is_from_list in kamailio. But FreeSWITCH originates INVITE to kamailio from IP_ADDR:RANDOM_PORT. In this case ds_is_from_list fails :(

Now I'm checking is there mistakes in my configs or this is normal usecase for FreeSWITCH (I did not mention it earlier).

2016-11-25 13:15 GMT+02:00 Vladyslav Zakhozhai <v.zakhozhai@gmail.com>:

David,

yes of course I'll be back with solution here :) But I'm not sure when exactly.

2016-11-24 12:30 GMT+02:00 David Villasmil <david.villasmil.work@gmail.com>:

Hello,

Please come back with the solution when you have it. It should be interesting for people using kamailio/freeswitch.

Regards,

David

On Wed, Nov 23, 2016 at 10:37 AM Vladyslav Zakhozhai <v.zakhozhai@gmail.com> wrote:

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

Official FreeSWITCH Sites
http://www.freeswitch.org
http://confluence.freeswitch.org
http://www.cluecon.com

FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
http://www.freeswitch.org

--

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

FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
http://www.freeswitch.org

--

С уважением,
Владислав Захожай

_________________________________________________________________________
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

FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
http://www.freeswitch.org

_________________________________________________________________________
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

FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
http://www.freeswitch.org

--

С уважением,
Владислав Захожай

--

С уважением,
Владислав Захожай

_________________________________________________________________________
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

FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
http://www.freeswitch.org