On Tue, Jul 9, 2013 at 10:02 AM, Nikolay Kondratyev <n.kondratyev@cpm.ru> wrote:

Hi All,

I’m new to freeswitch

Welcome to the community :)

and I’m investigating if i can use FS as SBC.

This topic has already been heavily discussed;

https://www.google.co.uk/search?q=freeswitch+sbc

https://www.google.co.uk/search?q=freeswitch+sbc+%22freeswitch-users%22&oq=freeswitch+sbc+%22freeswitch-users%22&aqs=chrome.0.57.243j0&sourceid=chrome&ie=UTF-8

http://www.moythreads.com/congresos/cluecon2012/cluecon-2012-kickass-sbc.pdf

https://wiki.freeswitch.org/wiki/SBC_Setup

https://wiki.freeswitch.org/wiki/SBC_FreeSWITCH_Configuration_Example_2

Please do try and do your home work before posting on the mailing list - the list is maintained by volunteers and most people will not response if they see the same questions being asked over and over again.

Here is a great guide on how to get the best out of the mailing list;

http://wiki.freeswitch.org/wiki/UsingTheMailingList

I see that one can use FS as SBC for incoming and outgoing calls.
But I was not able to find out if FS can be used for registration… I mean the subscriber from internet should send Register to FS, and FS should send Register to internal sip server. Is this possible?

FS is a B2BUA - it is not the same as using something like OpenSIPS.

http://en.wikipedia.org/wiki/Back-to-back_user_agent

http://wiki.freeswitch.org/wiki/The_Limitations_of_FreeSwitch

Another question is: what will happen with “contact parameters” in Invite and Register messages? Will FS pass unknown parameters through?

I’m interested in particular in the following Contact field:
Contact: <sip:+79980000004@10.169.10.64:5070;transport=udp>;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel,urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel.gsma.videocall";audio;video;q=0.8;+g.oma.sip-im;+g.oma.sip-im.large-message;expires=3600

If FS will get Invite or Register from Internet with such Contact, is it possible to preserve parameters (namely +g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel,urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel.gsma.videocall";audio;video;q=0.8;+g.oma.sip-im;+g.oma.sip-im.large-message;expires=3600) on the internal call leg?

Have a read through this for more information on how variables work;

http://wiki.freeswitch.org/wiki/Channel_Variables

You can control which variables get passed between legs using a variety of methods (set/export etc).

Hope this helps

Thanks in advance,

Nikolay.

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