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More Examples
A caller who is interested in (say) talking to callee might filter on the category talk, and its comprised services (voice/ivoice, video) -- example 1
A caller who is interested in sending a message might filter on the category msg and its comprised services…example 2

1) IN NAPTR 10 10 "U" "E2U+voice:h323" "!^.*$!h323:richard23@telekom.at!" .
2) IN NAPTR 10 10 "U" "E2U+sms:tel" "!^.*$!tel:+436644204100!;svc=sms" .
IN NAPTR 10 10 "U" "E2U+email:mailto" "!^.*$!mailto:richard@stastny.com!" .
or
PPT Version