Indeed, such issues related to UDP fragmentation should not happen, the packets can be up to 64k, bigger than MTU size. I think linux had it for more than 20 years and most of routers are based on it.

But surprisingly, there are still some routers that cannot cope with that -- I get hit from time to time (not too often, I have to say it) with support requests related to this matter and I also wonder how that is still the case today.

Cheers,
Daniel

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@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@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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Daniel-Constantin Mierla -- www.asipto.com
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