media release (multiple SDs) SIP media release behind the same IP address SIP RFC-2833 relay SIP proxy modes: redirect, proxy, or record route modes 164 SIP Trunking SIP Redirect processing modes: recurs, proxy, or tunnel SIP strict routing SIP loose routing SIP contact modes: m-address, strict, or loose routing Configurable SIP timers (global) Configurable SIP timers per realm Extended (fine-grained) configurable SIP timers and counters Tel URI support SIP-to-Tel URI conversion SIP status code mapping-per session agent SIP transit of unrecognized headers SIP Forced unregistration SIP configurable locally generated response codes by Session Agent SIP configurable locally generated response codes SIP RFC-3326 Reason w/Cause SIP Port mapping SIP selective PAI stripping per SIP interface SIP max message size filtering SIP media release across network interfaces Codec Reordering SDP Anonymization Aggregate Session Constraints (per SIP interface) SIP forced Hosted NAT Traversal (HNT) SIP restricted latching SIP Symmetric latching SIP server failover-timeout cache Implicit SERVICE ROUTE-SIP requests follow REGISTRATION SIP midcall reregistration following SERVICE ROUTE P-CSCF failure-timeout cache and forward based on DNS SIP Contact header encoding option Surrogate registration (IMS)-IMS aggregate endpoint support Chapter 9: Questions to Ask of a Service Provider Offering and an SBC Vendor SIP transport selection/backoff Implicit service route enhancements SDP-Response early media suppression SIP configurable response recursion SIP Privacy enhancements SIP early media suppression-fraud prevention SIP overload registration protection (avalanche restart protection) SIP Header Manipulation Rule support for regular expressions SIP CAC enhancement support for media release Registration event package NAT CAC, media policing, ToS for non-AVT types SDP-codec filtering and reordering SIP interface response map SIP response manipulation Header Manipulation Rule capability for SIP response code changing SIP dialogue move between