[Asterisk-Users] SIP on TCP

[Timothy Soos]

Ahh... I see that I misunderstood the question.  Thank you.

Tim

On Wednesday 03 September 2003 04:49 pm, Jamie Carl wrote:
> On Wed, 3 Sep 2003 15:47:35 -0600
>
>   Timothy Soos <XQL at americanisp.net> wrote:
> >*This message was transferred with a trial version of
> >CommuniGate(tm) Pro*
> >On Wednesday 03 September 2003 09:32 am, Master Abi
> >
> >wrote:
> >> Hi
> >>
> >> I read through the archives but could not find much
> >>reference to * using
> >> SIP on TCP instead of UDP for signalling. Can * be
> >>configured and if so
> >> how. My service provider will only accept SIP signalling
> >>on TCP.
> >>
> >> Thanks
> >>
> >> Master
> >
> >This suggestion is not exactly elegant, yet it may be of
> >help:
> >
> >"The UDP over TCP tunnel is a simple UDP-over-TCP
> >application written in Java,
> >and is designed so that people behind a firewall can
> >connect through a TCP
> >connection to play Quake and other UDP-based games."
> >
> >It is available at:
> >http://freshmeat.net/projects/udptunnel/?topic_id=907%2C150%2C151
> >--
>
> This wouldn't exactly help his situation.  Would this
> tunnel require this software running at both ends?  What
> he's talking about is SIP on TCP. Not SIP on UDP on TCP.
>
> SIP, by design, is supposed to be used with UDP as it has
> a lot of it's own transport control mechanisms, ie,
> retries, acks, etc, which allow for UDPs lack of
> reliability.
>
> However, SIP can run on TCP with no major changes apart
> from altering the stack to establishing a TCP connection
> before signalling.
>
>  From section 18 in RFC3261:
>
> ------------
> All SIP elements MUST implement UDP and TCP.  SIP elements
> MAY implement other protocols.
>
> Making TCP mandatory for the UA is a substantial change
> from RFC 2543.  It has arisen out of the need to handle
> larger messages, which MUST use TCP, as discussed below.
>  Thus, even if an element never sends large messages, it
> may receive one and needs to be able to handle them.
> ------------
>
> So if * wants to be RFC 3261 complient (which to get in
> anywhere commercial, it'll need to be) TCP MUST be
> implemented.
>
> Regards,
>
> Jamie Carl
> Jazz Inc.
> Email:  me at jazz-inc.net
> Web:    www.jazz-inc.net
> Phone:  +61-414-365-466
> Jabber: jazz at netmindz.net
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-- 
Thanks,
Timothy Soos
XQL, LLC
303-480-8228
720-979-3128 (Direct)