QuteCom uses src-port 5060 for outgoing connections. why?

[Chris Maciejewski]

Hi,

Just checked the following softphones: Twinkle, Ekiga, Xlite, Kphone
and ALL of them by default listen on port 5060. Also all (but Kphone)
allows to manually adjust port number via "System/Settings" kind of
dialog.

However I can't think of any practical reason why the phone should not
use any other port number?

Regards,
Chris

2008/8/7 Darshaka Pathirana <dpat at syn-net.org>:
> Hi!
>
> On 07.08.2008 14:05, Vadim Lebedev wrote:
>> If i remember correctly SIP RFC reccomends this behaviour,
>
> I just checked the RFC (again) and found no sign of this
> recommandation. In fact I only found Chapter 18 (Transport) in the
> RFC3261[1] which is quoted like this:
>
>  "Note that, because the source port is often ephemeral, but it
>   cannot be known whether it is ephemeral or selected through
>   procedures in [4], connections accepted by the transport layer will
>   frequently not be reused."
>
> which makes sense because SIP is on top of TCP/UDP and should not
> interfere in transport layer matters...
>
> [1] http://www.faqs.org/rfcs/rfc3261.html
> [4] http://www.faqs.org/rfcs/rfc3263.html
>
> After some research I also found [2] which encourage me to (really)
> think that always opening the same (source) port on client side can
> not be right way to do it! What do you think?
>
> [2] http://www.gont.com.ar/drafts/port-randomization/draft-larsen-tsvwg-port-randomization-01.html
>
>> Anyway, it think that  in advanced config options we can set a SIP port nr
>
> Yes, thanks, I know. FTR: "network.sip.local" is the setting in question
> but I would prefer a random source port selection over a fixed
> one...
>
> Any pros and cons, anybody?
>
> Greetings,
>  - Darsha
>
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