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Session Peering Proxy Service location function performed by egress Session Peering Proxy (SPP) of originating service provider(SP1) to locate ingress Session Peering Proxy of peering network or terminating service provider (SP2) and vice versa to setup a SIP session between SP1 and SP2. SPP1 may use ENUM to determine SIP URI of resource to route call. SPP determines ip address, port, transport of peering SPP using DNS SRV and NAPTR (implement RFC 3263, RFC 2782). UDP, TCP, TLS MUST be supported by SPP. TLS is preferred for peering. SPP should be deployed as multiple instances with different prioritization and weight for capacity based load balancing. All peering SIP signaling goes through SPP. |