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SUBSCRIBE sip:myprovider.com SIP/2.0 From: <sip:[email protected]>;tag=8177-afd-991 To: <sip:[email protected]> CSeq: 18992 SUBSCRIBE Call-ID: [email protected] Contact: <sip:[email protected]>

Via: SIP/2.0/UDP host.example.com;branch=z9hG4bK776asdhds Expires: 3600 Event: spirits-INDPs

Allow-Events: spirits-INDPs, spirits-user-prof Accept: application/spirits-event+xml Content-Type: application/spirits-event+xml Content-Length: ...

<?xml version="1.0" encoding="UTF-8"?>

<spirits-event xmlns="urn:ietf:params:xml:ns:spirits-1.0"> <Event type="INDPs" name="TAA" mode="N">

<CalledPartyNumber>6302240216</CalledPartyNumber> </Event>


The subscriber forms a SIP SUBSCRIBE request which identifies the DP that it wants to subscribe to (in this case, the TAA DP) and the actual line it wants that DP armed for (in this case, the line associated with the phone number 6302240216). This request eventually arrives at the SIPRITS notifier, N, which authenticates it (not shown) and sends a successful response to the subscriber:

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