[asterisk-bugs] [JIRA] (ASTERISK-26457) [patch] force_rport, auto_comedia: No NAT detection triggered.

[Alexander Traud (JIRA)]

Alexander Traud created ASTERISK-26457:
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             Summary: [patch] force_rport,auto_comedia: No NAT detection triggered.
                 Key: ASTERISK-26457
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26457
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General
    Affects Versions: 14.0.2, 13.11.2, 11.23.1
            Reporter: Alexander Traud


*Steps to Reproduce*
# Asterisk with {{nat=force_rport,auto_comedia}}
# first VoIP/SIP client (caller) uses public IP addresses in its SDP
  for example not within a NAT, like IPv6
# second VoIP/SIP client (callee) uses private IP addresses in its SDP
  for example within a NAT, for example IPv4 without STUN
# call is established = signaling via SIP is OK

*Expected Results*
Media (RTP) should flow, because comedia is enabled as Asterisk detected a NAT towards the callee. Asterisk is sending RTP to public IP addresses.

*Actual Results*
Media is one way (from callee to caller). Asterisk sends the media of the caller to the address mentioned in the SDP message of the callee. That was a private IP address. Therefore media does not reach the callee. Therefore one-way media.

*Workaround*
{{nat=auto_force_rport,auto_comedia}} fixed the issue for me, because the related code tests for a NAT in that case.

Asterisk should test for NAT, whether {{auto_force_rport}} or {{auto_comedia}} is set. This is done in other calling scenarios within Asterisk already. The attached patch does this for this scenario here as well.



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