Bug#906057: linphone: Linphone "cannot start transport on port 5060, maybe this port is already used" although it is not.

[Eduardo Casais]

Package: linphone
Version: 3.6.1-3
Severity: grave
Tags: ipv6
Justification: renders package unusable

Dear Maintainer,

After upgrading from Jessie 8 to Stretch 9 (64bits), Linphone has become
inoperative.

Linphone was used without problem with the setup and parameters under Jessie.
With the same configuration under Stretch, at start-up Linphone complains as
follows:

        Could not start tls transport on port 5060, maybe this port is already
used.

It is impossible to establish a call, or register to a SIP server.

The following approaches were attempted:

a) Changing from TLS to UDP or TCP

        Result: exactly the same problem remains.

b) Modifying the port number

        Result: no matter what port number is put, exactly the same issue
occurs.

        Checking with lsof -i -n -P, it appears that none of the ports
introduced
        are actually used. Linphone believes a port is in use while it is not.

d) Relying upon IPv6 instead of IPv4.

        Result:
        c.1) Linphone no longer complains about an occupied port.
        c.2) Linphone starts correctly listening to the port in question.
             lsof -i -n -P | egrep -i 5060 shows (for instance)

                linphone  9737     casaise   25u  IPv6 281289      0t0  UDP
*:5060

        c.3) However, it remains impossible to register the accounts to SIP
servers.
        c.4) Calling test accounts results in Linphone attempting to establish
the
             call but never managing to do it (timing out).

e) Some in the Internet suggest that the reason is a lack of privileges for the
user
   and that adding the user to the group plugdev or netdev could resolve the
situation.

        Result: the problem remains as it is.

f) The SIP utility Ekiga was also installed (but not started). Using Synaptic,
it was
   removed from the installation.

        Result: the problem remains as it is.

It may be that the in-place upgrade from Jessie to Stretch has left Linphone in
an
inconsistent state. I respectfully ask whether there is a workaround to the
above
problem.



-- System Information:
Debian Release: 9.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-7-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8), LANGUAGE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages linphone depends on:
ii  libasound2                1.1.3-5
ii  libatk1.0-0               2.22.0-1
ii  libavcodec57              7:3.2.12-1~deb9u1
ii  libavutil55               7:3.2.12-1~deb9u1
ii  libc6                     2.24-11+deb9u3
ii  libcairo2                 1.14.8-1
ii  libexosip2-11             4.1.0-2.1
ii  libfontconfig1            2.11.0-6.7+b1
ii  libfreetype6              2.6.3-3.2
ii  libgdk-pixbuf2.0-0        2.36.5-2+deb9u2
ii  libgl1-mesa-glx [libgl1]  13.0.6-1+b2
ii  libglew2.0                2.0.0-3+b1
ii  libglib2.0-0              2.50.3-2
ii  libglu1-mesa [libglu1]    9.0.0-2.1
ii  libgtk2.0-0               2.24.31-2
ii  liblinphone5              3.6.1-3
ii  libmediastreamer-base3    3.6.1-3
ii  libnotify4                0.7.7-2
ii  libogg0                   1.3.2-1
ii  libopus0                  1.2~alpha2-1
ii  libortp9                  3.6.1-3
ii  libosip2-11               4.1.0-2.1
ii  libpango-1.0-0            1.40.5-1
ii  libpangocairo-1.0-0       1.40.5-1
ii  libpangoft2-1.0-0         1.40.5-1
ii  libpulse0                 10.0-1+deb9u1
ii  libsoup2.4-1              2.56.0-2+deb9u2
ii  libspandsp2               0.0.6+dfsg-0.1
ii  libspeex1                 1.2~rc1.2-1+b2
ii  libspeexdsp1              1.2~rc1.2-1+b2
ii  libsqlite3-0              3.16.2-5+deb9u1
ii  libswscale4               7:3.2.12-1~deb9u1
ii  libtheora0                1.1.1+dfsg.1-14+b1
ii  libudev1                  232-25+deb9u4
ii  libupnp6                  1:1.6.19+git20160116-1.2
ii  libv4l-0                  1.12.3-1
ii  libvpx4                   1.6.1-3+deb9u1
ii  libx11-6                  2:1.6.4-3
ii  libxv1                    2:1.0.11-1
ii  linphone-nogtk            3.6.1-3

linphone recommends no packages.

Versions of packages linphone suggests:
ii  yelp  3.22.0-1

-- no debconf information