[asterisk-bugs] [JIRA] (ASTERISK-27971) res_pjsip: Implement additional SIP RFCs for Google Voice trunk compatability

[Nick French (JIRA)]

Nick French created ASTERISK-27971:
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             Summary: res_pjsip: Implement additional SIP RFCs for Google Voice trunk compatability
                 Key: ASTERISK-27971
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27971
             Project: Asterisk
          Issue Type: New Feature
      Security Level: None
          Components: pjproject/pjsip, Resources/res_pjsip_outbound_registration
    Affects Versions: GIT
            Reporter: Nick French


Background: Google Voice trunks are currently supported in Asterisk via chan_motif. Google has announced they plan to migrate away from the XMPP protocol used by chan_motif to a new SIP-based protocol. However, their new SIP servers use additional standards extending what is commonly implemented in a SIP UAC.

The following additional features required by the new Google Voice SIP registrar are not currently implemented in Asterisk:
- Service-Routes (RFC 3608)
- P-Preferred-Identity (RFC 3325)
- OAuth / Bearer token authentication (draft-ietf-sipcore-sip-authn-02)
- Mechanisms to use separate TLS transports for separate registrations and their associated message dialog
- (optional) User-configurable additions to SIP Contact header



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