[asterisk-bugs] [JIRA] (ASTERISK-24449) Reinvite for T.38 UDPTL fails if SRTP is enabled

[Andreas Steinmetz (JIRA)]

Andreas Steinmetz created ASTERISK-24449:
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             Summary: Reinvite for T.38 UDPTL fails if SRTP is enabled
                 Key: ASTERISK-24449
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-24449
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/T.38
    Affects Versions: 11.13.0
            Reporter: Andreas Steinmetz
            Severity: Minor


Asterisk does erroneously respect the SRTP setting for the SIP account when handling a reinvite for T.38 UDPTL.
Furthermore there are ATAs like the Cisco SPA112 that, in a T.38 UDPTL reinvite response, send "a=crypto" lines which seems to be plain wrong.

Quote from RFC4612:
"Further, there are no procedures in place for encrypting and protecting the integrity ofthe UDPTL stream."

Thus Asterisk needs to ignore anything related to SRTP when handling any T.38 UDPTL reinvite.




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