[Freeswitch-dev] Questions regarding the architecture
brian.west at mac.com
Thu Sep 7 15:44:14 EDT 2006
On Sep 7, 2006, at 2:26 PM, Alex Guan wrote:
> Great answers indeed. Thanks a lot! Is there a documentation
> system that I can save it to ... like a wiki? These information
> are too valuable to be buried in the mail archive.
We have trac.freeswitch.org or voip-info.org (I think we prefer it
being on trac)
> It took me a while but I think I have come to agreement for pretty
> much every point you made, except one. The only thing I felt
> suspicious is the busy waiting in which the originator polls
> check_channel_status() a million times after the originatee starts
> ringing but before it answers. Can't we wait for a mutex or
> condition waken up by CALL_ANSWERED? Imagine if you have a
> thousand incoming calls, there will be 1000 while loops spinning
> the processor.
Anthony will need to answer this one. ;)
> Another issue I noticed is that hold/resume is not working
> properly. There was no 200OK for the re-INVITE. I tried to debug
> further but somehow couldn't get into mod_exosip.c using gdb. (DDD
> and Eclipse behaved the same. Does anybody have the same issue?)
> I kind of guess the issue is what kind of SDP is the SIP phone
> sending for hold. The old way is to set an all zero O field, as
> opposed to SENDONLY or INACTIVE. Anyways, if mod_exopsip.c is
> going way, we should probably just wait for mod_sofia.
We still have work to do on sofia-sip to bring it up to speed with
all the features we want.
> Two more basic questions:
> 1. Licensing. A main problem I saw with Asterisk is it's GPL/
> Digium dual licensing scheme. I don't see any serious business
> development could be possible under this license. I think Mark and
> his company have made a big mistake on this subject. (And their
> business model as well.) What's the main rationale for you/other
> founders to choose MPL? Do you favour/oppose to commercial
> development using freeswitch in their proprietary systems?
The MPL allows you to commercialize the code. But Anthony can
elaborate on this subject more than I can. I don't want to speak on
> 2. Memory usage. I am seeing freeswitch using 25M bytes of memory
> with just one basic SIP call. It's a little surprising. Should I
> turn on the -Os to see if we can save some space?
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 25295 root 0 -20 27040 25m 3696 S 0 2.5 0:00.12 lt-
You can try it out and see. Also look at what modules you load.
When I start freeswitch up on my mac I use 6 or 7 megs of ram.
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