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Disclosing Session Information INV (offer) INV (offer) 200 (answer) 200 (answer) ACK ACK A P B INV (offer) INV (offer) 200 (answer) 200 (answer) ACK ACK A P B INV INV 200 (offer) 200 (offer) ACK (answer) ACK (answer) A P B INV INV 200 (offer) 200 (offer) ACK (answer) ACK (answer) A P B Two alternatives to disclose session information: Piggyback model (along with the offer/answer). Use a separate channel. Fig. 1: P provides policies for A / Offer in INVITE request Fig. 2: P provides policies for B / Offer in INVITE request Fig. 4: P provides policies for B / Offer in INVITE response Fig. 3: P provides policies for A / Offer in INVITE response |