[OpenSIPS-Users] REGISTER reply > MTU size?

[Ovidiu Sas]

If you have a few bindings, there shouldn't be any issues (assuming
that you have reasonable tags and headers).  In the end it's all about
fitting the whole info into the max packet size.  If you have large
bindings, then your chances to fit many bindings into a UDP packet are
small ... If the bindings are really large, you can try to trim them
before saving them (remove parameters if the client will be happy with
that).

-ovidiu

On Thu, Feb 7, 2013 at 1:57 PM, Pauba, Kevin L <KLPauba at west.com> wrote:
> Thanks for the reply, Ovidiu.
>
> Unfortunately, I can't modify the client to use TCP.
>
> Because of UDP fragmentation, it seems there should be a way to limit the size of the Contact header in the reply.  Would you agree?
> Is it uncommon for the list of bindings for an AOR to be this large?
>
> L8r
>
> -----Original Message-----
> From: users-bounces at lists.opensips.org [mailto:users-bounces at lists.opensips.org] On Behalf Of Ovidiu Sas
> Sent: Thursday, February 07, 2013 12:49 PM
> To: OpenSIPS users mailling list
> Subject: Re: [OpenSIPS-Users] REGISTER reply > MTU size?
>
> If you are registering over UDP and if the reply is exceeding the maximum UDP packet length, the reply will be indeed fragmented..
> http://en.wikipedia.org/wiki/User_Datagram_Protocol#Packet_structure
> (see length).
> One option would be to register over TCP to avoid fragmentation.
>
> Regards,
> Ovidiu Sas