the only reliable answer is use TCP.

The RFC is daft in this matter.
They say when it's bigger than mtu to automatically use TCP instead.
And timeout for 10 seconds then fall back to UDP.

Its mandatory in SIP to support both TCP and UDP up to 64k per packet.
As you can see, since barely anything will do this right, your best bet is to only use TCP when you have this kind of traffic.


On Tue, Nov 18, 2008 at 5:52 AM, Saurabh Aggarwal <saurabh_aggarwal@hotmail.com> wrote:
Thanks, how do I "enable" this in freeswitch? Can this be done through the SIP configuration file?
 
-Saurabh




Date: Tue, 18 Nov 2008 12:05:18 +0100
From: jonas.gauffin@gmail.com
Subject: Re: [Freeswitch-users] SIP Invite IP fragmentation issue

The rfc also describes why:

SIP provides a mechanism to represent common header field names in an
   abbreviated form.  This may be useful when messages would otherwise
   become too large to be carried on the transport available to it
   (exceeding the maximum transmission unit (MTU) when using UDP, for
   example).  These compact forms are defined in Section 20.  A compact
   form MAY be substituted for the longer form of a header field name at
   any time without changing the semantics of the message.  A header
   field name MAY appear in both long and short forms within the same
   message.  Implementations MUST accept both the long and short forms
   of each header name.



On Tue, Nov 18, 2008 at 11:52 AM, Iņaki Baz Castillo <ibc@aliax.net> wrote:
2008/11/18 Saurabh Aggarwal <saurabh_aggarwal@hotmail.com>:
> enabling compact headers - what is that?

SIP allows compact headers names for a few heades:

 From = f
 To = t
 Via = v
 ...


--
Iņaki Baz Castillo
<ibc@aliax.net>
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