[Freeswitch-users] SIP over WSS responding with 5060; transport=udp in Contact:

[Ciprian Dosoftei]

>
> This is likely a matter of semantics, but I think the RFC might favour the
>> current behaviour since the Contact endpoint is expected to be global (i.e.
>> function outside of the current dialog).
>>
>
> Not sure how it can be expected behavior to use a SIP UDP 5060 contact
> over a WSS interface that has no way of talking to SIP UDP 5060.
>

Hence the global scope of the Contact endpoint, I guess especially so in a
historical context ... for devices limited to a handful of
connectivity options, such as WSS, it _might_ be expected to follow a rport
approach. As with some SIP concepts, there's a big gap between original
spec/RFC intent and the field implementations. Not really sure where this
one stands!


> How did you modify SIP.js?
>

I've only modified the linked demo (https://sipjs.com/guides/full-demo-app/)
to see how it behaves with a stock FS install, here's the resulting fiddle:
http://jsfiddle.net/o890yfs7/ -- line #3 is the host on which the Sofia
profile is listening to requests. I've tested against a Docker instance
(using host network mode) as follows:

FROM debian:buster

RUN apt-get update && apt-get install -y gnupg2 wget lsb-release
RUN wget -O -
https://files.freeswitch.org/repo/deb/debian-release/fsstretch-archive-keyring.asc
| apt-key add -
RUN echo "deb http://files.freeswitch.org/repo/deb/debian-release/
`lsb_release -sc` main" > /etc/apt/sources.list.d/freeswitch.list
RUN echo "deb-src http://files.freeswitch.org/repo/deb/debian-release/
`lsb_release -sc` main" >> /etc/apt/sources.list.d/freeswitch.list
RUN apt-get update && apt-get install -y freeswitch-meta-all

RUN rm -rf /etc/freeswitch/sip_profiles/*ipv6*

COPY files /

CMD ["freeswitch", "-nonat"]

There's an intentional 10 seconds delay in the default dialplan you can use
to test the CANCEL behaviour while the other extension is ringing.
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