[asterisk-bugs] [JIRA] (ASTERISK-27347) [patch] pjproject_bundled: Disable TCP/TLS keep-alives.

[Alexander Traud (JIRA)]

Alexander Traud created ASTERISK-27347:
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             Summary: [patch] pjproject_bundled: Disable TCP/TLS keep-alives.
                 Key: ASTERISK-27347
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27347
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_pjsip_keepalive
    Affects Versions: 15.0.0, 14.6.2, 13.17.2
            Reporter: Alexander Traud


PJSIP tries to keep TCP (and TLS) based SIP connections open. For this, a double newline (CRLNCRLN) is send every 90 seconds, even if PJSIP is the User-Agent Server (UAS). This is not supported by many User-Agent Clients (UAC), especially when this comes in-between a transaction.

For example, I set the re-registering to 180 seconds. Then, my Gigaset DE900 IP Pro does a re-register half of that timeout, every 90 seconds. The Gigaset sents a REGISTER, gets a Proxy-Authentication-Required, and then got the keep-alive message. That halted the SIP stack of the Gigaset, the Gigaset closed the underlying TCP connection, and the whole Gigaset had to be restarted to be usable again.

In PJProject, this keep-alive mechanism can be disabled (only) at compile time, like {{CFLAGS="-DNDEBUG=1 -DPJ_HAS_IPV6=1 -DPJSIP_TCP_KEEP_ALIVE_INTERVAL=0 -DPJSIP_TLS_KEEP_ALIVE_INTERVAL=0" ./configure --enable-shared}}

Since version 13.2.0 (ASTERISK-24644, Commit [915bb88|http://github.com/asterisk/asterisk/commit/915bb88d3e973f647eb9d9e560688d6a02af2c2a]), Asterisk replaced this compile-time feature with the runtime setting {{keep_alive_interval}} which can be changed via the configuration file {{pjsip.conf}}. On default, this feature is zero = off. However, to make this work, PJProject must be compiled without its own keep-alive mechanism. This was never mentioned in the [Asterisk Wiki|http://wiki.asterisk.org/wiki/display/AST/PJSIP-pjproject#PJSIP-pjproject-externalBuildingandInstallingpjprojectfromSource].

Since version 13.8.0 (Commit [b59956a|http://github.com/asterisk/asterisk/commit/b59956a875817367834431e7f1fa02486b5aed7f]), Asterisk allows {{./configure --with-pjproject-bundled}} which extracted all the required DEFINEs and flags from the Wiki and sets those automatically. Again, the keep-alive mechanism of the PJProject is not disabled.

The attached patch rectifies these omissions for the bundled PJProject. Hopefully somebody with write-access adds those DEFINEs to the Asterisk Wiki as well.



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