[asterisk-bugs] [JIRA] (ASTERISK-20741) nat=force_rport, comedia does not behave the same as nat=yes

[Matt Jordan (JIRA)]

Matt Jordan created ASTERISK-20741:
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             Summary: nat=force_rport,comedia does not behave the same as nat=yes
                 Key: ASTERISK-20741
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20741
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Core/Configuration
    Affects Versions: 11.0.1
         Environment: Gentoo Linux 64 bit PowerPC, kernel 3.6.1, GCC 4.5.3
            Reporter: headphones
            Severity: Minor


After an upgrade from 1.8.17.0 to 11.0.1 we get warnings about the deprecation of nat=yes in sip.conf:
{{\[Nov 10 14:02:14\] WARNING\[28487\]: sip/config_parser.c:812 sip_parse_nat_option: nat=yes is deprecated, use nat=force_rport,comedia instead}}

If we change to nat=force_rport,comedia the behavior seems to be fine, except for outside users behind NAT. Our server is also behind NAT.

When an outside NAT:ed user calls in to the network everything works as expected, but when calling the outside user, or when two outside NAT:ed users call each other, the audio only goes one way without any errors shown in the console. When changing back to nat=yes, everything work again.

By looking in the source code for sip/config_parser.c, it seems like the reason for the difference is that when using sip=yes, the auto_force_rport and auto_comedia are cleared from &flags\[2\]. However, when using force_rport,comedia, the auto equivalents are not cleared away.

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