[SR-Users] Compressing SIP messages

Igor Olhovskiy igorolhovskiy at gmail.com
Mon Apr 1 17:23:59 CEST 2019


Idea is to fit whole packet in MTU size.
Mainly cause fragmentation is not best option in case of UDP. Causes retransmissions on a high CPS values.

Regards, Igor
On Apr 1, 2019, 6:20 PM +0300, Steve Davies <steve-lists-srusers at connection-telecom.com>, wrote:
> Never quite got this.  UDP packets can be up to 64k, right?  And fragmentation is a standard IP feature if a packet is bigger than MTU size.
>
> Steve
>
>
> > On Mon, 1 Apr 2019 at 16:43, Alex Balashov <abalashov at evaristesys.com> wrote:
> > > The customary inter-Kamailio solution is jumbo frames (if you control network end-to-end) or TCP.
> > >
> > > —
> > > Sent from mobile, with due apologies for brevity and errors.
> > >
> > > On Apr 1, 2019, at 10:33 AM, Igor Olhovskiy <igorolhovskiy at gmail.com> wrote:
> > >
> > > > Hi!
> > > >
> > > > Was looking on some way to compress SIP signalling between internal servers. But found out, there are no some pre-defined or recommended mechanism of doing this.
> > > > Yes, I found gzcompress module, but it will help only in case of big body, but not whole message itself. Like in some cases you can have 4-5 RR headers, which is already a lot of info.
> > > >
> > > > What I googled is
> > > >
> > > > 1. > > > > SigComp
> > > > 2. > > > > Compact Header form
> > > >
> > > > As I found, SigComp is really not widely-used method and it support along opensource SIP servers/PBXes is not documented.
> > > > For Compact Header form - is there any way of using Kamailio to compress message this way?
> > > > Maybe also there is a way of having some intermediate proxy-layer software, that will gzip/gunzip SIP signalling in realtime?
> > > >
> > > > All of this actually cause info in SIP/SDP grows rapidly, unfortunately MTU size is not.
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