[Freeswitch-users] SIP Invite IP fragmentation issue

[Anthony Minessale]

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 at 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 at gmail.com
> To: freeswitch-users at lists.freeswitch.org
> 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, Iñaki Baz Castillo <ibc at aliax.net>wrote:
>
> 2008/11/18 Saurabh Aggarwal <saurabh_aggarwal at hotmail.com>:
> > enabling compact headers - what is that?
>
> SIP allows compact headers names for a few heades:
>
>  From = f
>  To = t
>  Via = v
>  ...
>
>
> --
> Iñaki Baz Castillo
> <ibc at aliax.net>
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-- 
Anthony Minessale II

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