[SIPForum-discussion] SIP using TCP or UDP?

[raman kumar]

Razual has explained the right reson. To use the power of UDP
connectionaless protocol the
 timer mechanism is inbuilt in the sip

On 14/01/07, Rezaul Kabir <rezaulkabir at gmail.com> wrote:
> I have not heard any such restrictions on the size of packet. But UDP
> is used by default and if you closely look at RTC 3261 Section
> 13.3.1.4 you will notice that it talks about a timer to retransmit
> packets and similar example is available in the rfc in several areas.
> This behavior of retransmission clearly indicates that it is desirable
> to use non-reliable transport such as UDP to send the packets.
> According to RFC3263 Section 4.1 is the Sip Uri does not specify any
> transport then UDP should be selected. Also by RFC2543 UDP is
> mandatory if no transport is defined and for good interpretability.
> TCP should only be used if one is thinking of using SIPS/TLS OR the
> Sip Uri specifies TCP as transport.
>
>
> ----
> Rezaul Kabir
>
>
> On 1/13/07, madan kumar <mada2k at gmail.com> wrote:
> > i far as i know udp is used when the packet size is less than 1200 bytes
> and
> > TCP is used when it exceeds 1200 bytes ..... do any of u have a
> explanation
> > for this
> >
> >
> > On 1/10/07, raman kumar <ramank24 at gmail.com> wrote:
> > > when using the sip at the back-end use the UDP
> > > When using in the local premises use TCP
> > >
> > >
> > >
> > > On 26/12/06, Ramachandran <rgunasekaran at velankani.com> wrote:
> > > > Dear all,
> > > >
> > > >
> > > >
> > > >  I am not very sure about the following,
> > > >
> > > >
> > > >
> > > > What is ideal transport protocol for SIP with IMS deployment?
> > > >
> > > > When to use SIP using UDP?
> > > >
> > > >
> > > >
> > > > Thanks,
> > > >
> > > > Ram
> > > >
> > > >
> > > >
> > > >
> > > >
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