[asterisk-bugs] [JIRA] (ASTERISK-21417) Implement SDES-SRTP support in chan_gulp

[Matt Jordan (JIRA)]

Matt Jordan created ASTERISK-21417:
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             Summary: Implement SDES-SRTP support in chan_gulp
                 Key: ASTERISK-21417
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21417
             Project: Asterisk
          Issue Type: New Feature
      Security Level: None
          Components: Channels/chan_gulp, Resources/res_srtp
            Reporter: Matt Jordan


This task is to implement SDES-SRTP support in chan_gulp. This includes:

* Refactoring out the setup of an SRTP session - given a set of SDP parameters - to minimize code duplication between chan_sip and chan_gulp. This would involve improving the code in sdp_crypto and sharing it between both channel drivers.
* Defining and adding the necessary configuration parameters to an endpoint to enable encryption
* Performing SRTP initialization on inbound requests and responding with the appropriate keys in a response
* Transmitting SRTP keys given an endpoint's support for encryption
* Re-initializing an SRTP session on a channel if a re-INVITE contains new keys
* Adding automated tests to the test suite for chan_gulp that test negotiating SRTP keys

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