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Problem Emergency calls route based on location (e.g. what PSAP serves you depends on where you are) Therefore, location must be on first message (INVITE in SIP There are 2 or more intermediaries between the origination and termination that need location; it’s not end to end Post Dial Delay (e.g. rule processing time) is very limited (fraction of a second for 2 second PDD) Rules for retention, forwarding, and to some extent, accuracy are determined by local laws RM is LR |