[Spce-user] SIP UDP packet fragmentation breaking calls

[Marco Teixeira]

Hi Daniel,

Thank you for your reply.
Please consider getting it onto your roadmap to keep your amazing product
RFC compliant.

For clarity here is the link i forgot to past (i guess)
https://support.software.dell.com/kb/sw10958

---
Best regards
Marco


On Tue, Sep 22, 2015 at 2:57 PM, Daniel Grotti <dgrotti at sipwise.com> wrote:

> Hi Marco,
> SPCE does not fallback in TCP unfortunately.
> you should reduce the MTU by removing headers or you should be able to
> rebuild your fragmented packets at the final destination.
>
> --
> Daniel Grotti
> VoIP Engineer
>
>
> Sipwise GmbH
> Europaring F15 | 2345 Brunn am Gebirge, Austria | www.sipwise.com
>
> On 09/21/2015 11:27 PM, Marco Teixeira wrote:
> > Hi there,
> >
> > I might have stumbled upon the issue described here (but without any ALG
> > in the middle, just for example, as i can't pass any sensitive info here)
> >
> > I'm seeing fragmented SIP packets when the final gateway sends OPTION
> > back over 2 NGCP CE and over to a final farm of SIP servers...
> >
> > The call is established correctly and only when the OPTIONs don't get
> > ACK, the call drops within 10 seconds (always).
> >
> > So, according to the test on that link, trancript below:
> > (..) If a request is within 200 bytes of the path MTU, or if it is larger
> >    than 1300 bytes and the path MTU is unknown, the request MUST be sent
> >    using an RFC 2914 [43] congestion controlled transport protocol, such
> >    as TCP. (...)
> >
> > Shouldn't SIPWISE activate TCP or whatever to avoid this ?
> > How did you guys solve this ?
> > (no, TCP on all calls is really asking for trouble on the call volume
> > i'm aimming for)
> >
> >
> > Best regards
> > Marco
> >
> >
> > _______________________________________________
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> > Spce-user at lists.sipwise.com
> > https://lists.sipwise.com/listinfo/spce-user
> >
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