MPLS IP Bridging Configuration Guidance for IEPREP
Nyquetek Inc
An Internet Emergency Preparedness (IEPREP) telephony service IP Bridging topology using Multi-Protocol Label Switching (MPLS) should provide Emergency Telecommunications Service (ETS) using a) Session Initiation Protocol (SIP) Priority header value of 'emergency', b) Session Description Protocol (SDP) attribute experimental parameters to designate the call (session) as either a National Emergency call, International Emergency call, or both, c) MEGACO context descriptors of priorities 1-6 and emergency indication, and d) MPLS E-LSPs with a dedicated codepoint specifying application of ETS Per-Hop Behavior (PHB). IP Differentiated Services marking should use specified code points allocated from the Experimental and Local Use pool (pool 2) to designate the traffic as either National Emergency or International Emergency for corresponding PHB use. Signaling between the Signaling Gateway (SG) and Media Gateway Controller (MGC) should apply the MTP3 SS7 protocol over the M2UA adaptation protocol for use of the Stream Control Transmission Protocol (SCTP). Support is suggested for work in progress on defining a SIP Resource Priority header and defining a SIP telephone url extension for calling party category designation.