Well, could help... but in my case both UDP and TCP should be supported, but
not all UACs I work with support TCP, only some...
On Wed, Feb 3, 2010 at 4:39 PM, <mikhail.zabal...@nokia.com> wrote:
> Hi,
>
>
>
> You can bind your stack exclusively to UDP, if you use the parameter “
> transport=udp” in the tag NUTAG_M_PARAMS.
>
>
>
> Hope this helps,
>
> Mikhail
>
>
>
> *From:* ext Aleksander Morgado [mailto:sofia-sip-de...@aleksander.es]
> *Sent:* Friday, January 22, 2010 5:26 PM
> *To:* sofia-sip-devel
> *Subject:* Re: [Sofia-sip-devel] SIP request through TCP if size is longer
> than threshold
>
>
>
>
>
> When a SIP request long enough is created, like with a large payload,
> Sofia-SIP automatically tries to send the request through TCP instead of
> UDP. I understand that if packet size is more than the maximum UDP packet
> size allowed in the physical network it will not be sent.
>
> But can this behavior be disabled so that instead of trying TCP, the UDP
> request creation *fails*?
>
>
>
> This max limit for SIP requests is 1300, as found in some comments in
> sofia-sip source:
>
> * Maximum size of outgoing UDP request.
> *
> * The maximum UDP request size is used to control use of UDP with overtly
> * large messages. The IETF requires that the SIP requests over 1300 bytes
> * are sent over congestion-controlled transport such as TCP. If a SIP
> * message size exceeds the UDP MTU, the TCP is tried instead of UDP. (If
> * the TCP connection is refused, the stack reverts back to UDP).
>
>
> Anyway, another option instead of automatically sending it from TCP is to
> tell the app that the UDP request cannot be sent, so that the application
> can handle it and split the request in several less-sized UDP packets.
>
> I am thinking in large NOTIFYs for example. So if sofia-sip detects that
> NOTIFY size is greater than 1300 bytes, depending on the configuration of
> the NTA we could either send the packet using TCP as IETF requires, or tell
> the application that size is too big so that it can split the NOTIFY in
> several ones.
>
> How difficult could it be to implement this in sofia-sip?
>
> Cheers,
> -Aleksander
>
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