[asterisk-bugs] [JIRA] (ASTERISK-27437) [patch] chan_sip/ICE: server-reflexive candidates (srflx) with Dual-Stack.

[Alexander Traud (JIRA)]

Alexander Traud created ASTERISK-27437:
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             Summary: [patch] chan_sip/ICE: server-reflexive candidates (srflx) with Dual-Stack.
                 Key: ASTERISK-27437
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27437
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/IPv6, Resources/res_rtp_asterisk
    Affects Versions: 15.1.2, 13.18.2
            Reporter: Alexander Traud


When ICE and IPv4+IPv6 (Dual-Stack) are enabled, no server-reflexive ICE candidates (srflx) are advertised in SDP, even if a user-agent client is connected via IPv4 only.

*Steps to reproduce*
# Asterisk behind a NAT
# channel driver _chan_sip_
# configuration file _sip.conf_ enabled for IPv6: {{bindaddr=::}}
# configuration file _sip.conf_ enabled for ICE: {{icesupport=yes}}
# call an extension on this Asterisk server, trace with Wireshark

*Expected results*
The answer to the SIP-INVITE contains an SDP media session with server-reflexive ICE candidates, like:
{{a=candidate:2 1 UDP 1694498815 192.0.2.3 45664 typ srflx raddr 10.0.1.1 rport 8998}}

*Actual results*
The answer to the SIP-INVITE contains an SDP media session without any server-reflexive ICE candidates.

*Notes*
The current source code works for IPv4-only servers. In all other cases (IPv6-only, IPv4+IPv6) no srflx are gathered. The attached patch gathers srflx even when Asterisk is enabled for IPv4+IPv6. When no IPv4 interface is available (Asterisk is IPv6-only), the proposed patch does not gather srflx as before.



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