[Freeswitch-users] Presence Sanity Check
ira at connectmevoice.com
Tue Apr 9 01:02:15 MSD 2013
Thank you for your information. It did help!
Lead Software Engineer
(732) 490-9007 x2
ira at connectmevoice.com
On Sun, Apr 7, 2013 at 12:49 PM, Cal Leeming [Simplicity Media Ltd] <
cal.leeming at simplicitymedialtd.co.uk> wrote:
> In regards to the UDP fragmentation, this is an extremely good question.
> Only yesterday I started to build a simple forwarding SBC in Python using
> UDP sockets, however I came up against the same theoretical problem of
> packets being larger than 1500 bytes.
> I've had a read through various documentation;
> Anthony has stated the following;
> *"the only reliable answer is use TCP."*
> There was also the option of enabling compact headers;
> From what I can tell, there is no way to guarantee this problem won't
> happen unless you use TCP. You could reduce the packet size by compacting
> headers or removing codecs, but this would be on the assumption that every
> hop is running at 1500 MTU.
> Hope this helps!
> On Sat, Apr 6, 2013 at 2:28 PM, Ira Tessler <ira at connectmevoice.com>wrote:
>> I just need a little guidance with the way presence works. Forgive me if
>> I am asking novice questions.
>> Background (simple version)
>> We run Freeswitch in a hosted/cloud environment in a data center. We have
>> IP phones in our office on our LAN.
>> That way I am understanding how Presence works, I am just learning this,
>> is that when a BLF button is programmed on a phone, that phone will send a
>> "Subscribe" message to Freeswitch. The subscriptions are stored in the
>> sip_subscriptions table (i think) in the sofia database for the sip
>> profile. When calls come in for that subscription, Freeswitch will send out
>> a NOTIFY message to the phone that subscribed in order to change the state
>> of the BLF Light.
>> He is my questions/issue/confusion.
>> All our phones use UDP which has a maximum packet size of 1500 bytes.
>> When doing a sofia global siptrace on, I notice that most of the NOTIFY
>> messages are greater then 1500 bytes. That will cause packet fragmentation.
>> So if the NOTIFY message is fragmented, will it get to the phone correctly?
>> (all the time, some of the time, never??)
>> If the the answer is other then ("all the time"), how do I fix this? The
>> only solution I can come up with is having my phones use TCP instead of
>> UDP. Is that the correctly solution? Did anyone else out there run into
>> this issue and if so, what is the "best practice" solution (if there is
>> Thank you in advance!
>> Ira Tessler
>> Lead Software Engineer
>> (732) 490-9007 x2
>> ira at connectmevoice.com
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> Official FreeSWITCH Sites
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> Official FreeSWITCH Sites
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
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