P-Early-Media Trusted to Untrusted

This table illustrates the P-CSCF case when messages are received from trusted endpoints and forwarded to untrusted endpoints.

Message Parameters configured on egress interface	Request (Invite, UPDATE, PRACK) w/o header	Request (Invite, UPDATE, PRACK) with header with one or more direction parameters where each has one of the values: "sendrecv", "sendonly", "recvonly", or"inactive"	Response (18x, 200OK(UPDATE/PRACK)) w/o header.	Response (18x, 200OK(UPDATE/PRACK) with header with one or more direction parameters where each has one of the values: "sendrecv", "sendonly", "recvonly", or"inactive"
p-early-media-header-"add" p-early-media-direction -"sendonly"	Setup flows based on SDP value.	Discard the header. Setup flows based on SDP value.	Setup flows based on SDP value.	Discard the header. Setup flows based on local config PEM value. Status Flow AVP in AAR message updated.
p-early-media-header-"modify" p-early-media-direction -"sendonly"	Setup flows based on SDP value.	Discard the header. Setup flows based on SDP value.	Setup flows based on SDP value.	Discard the header. Setup flows based on local config PEM value. Status Flow AVP in AAR message updated.
p-early-media-header-"add" No p-early-media-direction	Setup flows based on SDP value.	Discard the header. Setup flows based on SDP value.	Setup flows based on SDP value.	Discard the header. Setup flows based on default PEM value. Status Flow AVP in AAR message updated.
p-early-media-header-"modify" No p-early-media-direction	Setup flows based on SDP value.	Discard the header. Setup flows based on SDP value.	Setup flows based on SDP value.	Discard the header. Setup flows based on default PEM value. Status Flow AVP in AAR message updated.