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#1: SIP SUBSCRIBE/NOTIFY UA subscribes to session policies using provided URI. UA submits session description in SUBSCRIBE body. Policies are returned in NOTIFY messages. Asynchronous policy updates via NOTIFY messages. Use (possibly long-lived) TLS connection to proxy or policy server. #2: SIP SUBSCRIBE/NOTIFY + PUBLISH Same as #1. UA submits session description in PUBLISH. Open Issue: Policy Channel Protocol (1) |