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can use the IPSP transparency flag 'resourcePriorityOptionTag' to transparently pass the 'resource-priority' option tag received in Require or Supported header of various SIP messages, such as INVITE, REGISTER, SUBSCRIBE (but not in-dialog SUBSCRIBE), PUBLISH, REFER, NOTIFY, UPDATE, MESSAGE, OPTIONS, CANCEL, OOD, and GW-GW transparency. This flag is available to both the ERE and external PSX. See CLI
commonIpAttributes Common IP Attributes - SIP - CLI or EMA
Signaling - Ip Signaling Profile - Common Ip Attributes for configuration details.
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The SBC supports a header tag length of up to 256 characters.
P-DCS-LEAS header support is defined in RFC 3603 for PacketCable 2.0 Electronic Surveillance. The P-DCS-LAES extension contains the information needed to support Lawfully Authorized Electronic Surveillance. This header contains the address and port of an Electronic Surveillance Delivery Function for delivery of a duplicate stream of event messages related to a call. This header is only used between proxies and trusted User Agents. An example of this header is:
P-DCS-LAES: 10.252.139.180:1813; content=10.252.139.180:45006;
bcid=D0E4965A2020202020373035302D30353030303000423403; cccid=015E8061
If
receives this particular header (in 18x or 2xx), the SBC will send the two-way media in PCLI (PacketCable Lawful intercept) format with the “cccid” derived from the P-DCS-LAES header to the address and port identified by “content” parameter. The duplicate stream is formed at the point where the P-DCS-LAES header is received. The implication of this is media played in the “backwards” direction from the opposite side of the call prior to full media cut-through will not be present in the tapped media stream. One example of this is when Local Ringback Tone is enabled, it will not be present in the tapped media information. However, the advantage of this methodology is that it ensures that only the information from the specific endpoint where the tap request came from will be tapped.