[Freeswitch-users] Conceptual Question about Freeswitch and SIP

[Kurt Marasco]

Thanks for your comments Ken. They were very helpful. This group is 
great. I always seem to get multiple responses:)

Ken Rice wrote:
> FreeSwitch has 3 modes of operation when it comes to sip calls. Please Note
> FreeSwitch is a B2BUA and not a proxy although it has proxy like modes.
>
> Mode 1) Full Media Interaction this is what you are seeing. You can
> completely interact with the media stream allowing for sniffing the media,
> transcoding, or injecting the media for various purposes.
>
> Mode 2) Media Proxy only mode. In this mode FreeSwitch just acts as a dumb
> RTP proxy for things like Topology Hiding and NAT busting. SIP SDPs are
> copied across with updates to where to send the media and a socket is set up
> for relaying the media. The RTP/UDPTL is just copied across the socket.
>
> Mode 3) No Media Mode. In this mode the SDPs are copied across and media is
> setup end to end... No media comes into freeswitch...
>
> All 3 Modes are more efficient and mode scalable then some other well known
> software. This is not necessarily due to the SIP stack in use, but more from
> a design perspective of taken from what Anthm and crew learned over the
> years as not to do.
>
>
>
>   
>> From: Kurt Marasco <kmarasco at faithwork.org>
>> Reply-To: <freeswitch-users at lists.freeswitch.org>
>> Date: Sun, 16 Mar 2008 20:03:01 -0700
>> To: <freeswitch-users at lists.freeswitch.org>
>> Subject: [Freeswitch-users] Conceptual Question about Freeswitch and SIP
>>
>> It's my understanding that when I call from one SIP address to another
>> that Freeswitch manages the invites and then directly connects the two
>> sip devices, such that freeswitch is no longer involved in the
>> conversation. Is this how it is supposed to work?
>>
>> The reason for my question is that the rtp traffic is going through my
>> freeswitch ip address at all times. It seems that both ends are speaking
>> g711u, so I don't believe that any transcoding is going on.
>>
>> I must be missing something because having all data flow through
>> Freeswitch would not be scalable and I know that one of the big
>> differences that Freeswitch offers is scalability.
>>
>> What am I missing....and I know that I am:)
>> Kurt
>>
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>
>
>
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