[Asterisk-code-review] chan_sip: Set up calls without audio (text+video), again. (asterisk[18])

[Alexander Traud]

Hello George Joseph, Friendly Automation, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/c/asterisk/+/15378

to look at the new patch set (#2).

Change subject: chan_sip: Set up calls without audio (text+video), again.
......................................................................

chan_sip: Set up calls without audio (text+video), again.

The previous commit 6d980de fixed this issue in the core of Asterisk.
With that, each channel technology can be used without audio
theoretically. Practically, the channel-technology driver chan_sip
turned out to have an invalid check preventing that. chan_sip tested
whether there is at least one audio format. However, chan_sip has to
test whether there is at least one format. More cannot be tested while
requesting chan_sip because only the [general] capabilities but not the
[peer] caps are known yet. And the [peer] caps might not be a subset or
show any intersection with the [general] caps. This change here fixes
this.

The original commit f04d5fb, thirteen years ago, contained a software
bug as it passed ANY audio capability to the channel-technology driver.
Instead, it should have passed NO audio format. Therefore, this
addressed issue here was not noticed in Asterisk 1.6.x and Asterisk 1.8.
Then, Asterisk 10 changed that from ANY to NO, but nobody reported since
then.

ASTERISK-29265

Change-Id: Ic16a3bf13cd1b5c4fc4041ed74961177d96b600f
---
M channels/chan_sip.c
1 file changed, 2 insertions(+), 12 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/78/15378/2
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Gerrit-Project: asterisk
Gerrit-Branch: 18
Gerrit-Change-Id: Ic16a3bf13cd1b5c4fc4041ed74961177d96b600f
Gerrit-Change-Number: 15378
Gerrit-PatchSet: 2
Gerrit-Owner: Alexander Traud <pabstraud at compuserve.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-MessageType: newpatchset
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