[Bug 235236] net/asterisk15 improvement: force setvar to override previous value in chan_sip, chan_iax2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235236

            Bug ID: 235236
           Summary: net/asterisk15 improvement: force setvar to override
                    previous value in chan_sip, chan_iax2
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: madpilot at FreeBSD.org
          Reporter: pfduch at yandex.ru
             Flags: maintainer-feedback?(madpilot at FreeBSD.org)
          Assignee: madpilot at FreeBSD.org

Created attachment 201436
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=201436&action=edit
patch for chan_sip and chan_iax2

In chan_sip and chan_iax2, variable set by setvar option cannot be overriden
later. E.g.:

[tmpl](!)
setvar=foo=bar

[some-peer](tmpl)
setvar=foo=baz ; no chance: "${SIPPEER(some-peer,chanvar[foo])}" in dialplan
still returns "bar"


Actually, second setvar appends an attribute-value pair to a list, but only the
first one is always read.

A ticket in asterisk JIRA is still open for a long long time:
https://issues.asterisk.org/jira/browse/ASTERISK-23756

Unlike chan_sip and chan_iax2, chan_dahdi, for example, was already fixed for
that.

I use the attached patch for a several years without any problems on versions
11.x, 13.x, 15.x, both i386 and amd64. It would be nice to include it to
mainstream. Maybe it makes sense even to enable it by default.

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